30100021 has 4 divisors (see below), whose sum is σ = 34400032. Its totient is φ = 25800012.

The previous prime is 30100019. The next prime is 30100051. The reversal of 30100021 is 12000103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30100021 - 2¹ = 30100019 is a prime.

It is a super-2 number, since 2×30100021² = 1812022528400882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 4300003 = 30100021 / (3 + 0 + 1 + 0 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30099977 and 30100013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30100051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2149995 + ... + 2150008.

It is an arithmetic number, because the mean of its divisors is an integer number (8600008).

Almost surely, 2^30100021 is an apocalyptic number.

It is an amenable number.

30100021 is a deficient number, since it is larger than the sum of its proper divisors (4300011).

30100021 is an equidigital number, since it uses as much as digits as its factorization.

30100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4300010.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 30100021 is about 5486.3486035796. The cubic root of 30100021 is about 311.0681880929.

Adding to 30100021 its reverse (12000103), we get a palindrome (42100124).

The spelling of 30100021 in words is "thirty million, one hundred thousand, twenty-one".