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30125021 = 148120341
BaseRepresentation
bin111001011101…
…0101111011101
32002200111202112
41302322233131
530203000041
62553403405
7514026023
oct162725735
962614675
1030125021
1116006413
12a109565
136319b74
144002713
1529a0deb
hex1cbabdd

30125021 has 4 divisors (see below), whose sum is σ = 30146844. Its totient is φ = 30103200.

The previous prime is 30124981. The next prime is 30125023. The reversal of 30125021 is 12052103.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12052103 = 71721729.

It can be written as a sum of positive squares in 2 ways, for example, as 15912121 + 14212900 = 3989^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 30125021 - 26 = 30124957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30124987 and 30125005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30125023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8690 + ... + 11651.

It is an arithmetic number, because the mean of its divisors is an integer number (7536711).

Almost surely, 230125021 is an apocalyptic number.

It is an amenable number.

30125021 is a deficient number, since it is larger than the sum of its proper divisors (21823).

30125021 is a wasteful number, since it uses less digits than its factorization.

30125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21822.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 30125021 is about 5488.6265130723. The cubic root of 30125021 is about 311.1542849617.

Adding to 30125021 its reverse (12052103), we get a palindrome (42177124).

The spelling of 30125021 in words is "thirty million, one hundred twenty-five thousand, twenty-one".

Divisors: 1 1481 20341 30125021