30151421 has 4 divisors (see below), whose sum is σ = 31925052. Its totient is φ = 28377792.

The previous prime is 30151399. The next prime is 30151439. The reversal of 30151421 is 12415103.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22372900 + 7778521 = 4730^2 + 2789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30151421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1773613 = 30151421 / (3 + 0 + 1 + 5 + 1 + 4 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30151421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30151481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886790 + ... + 886823.

It is an arithmetic number, because the mean of its divisors is an integer number (7981263).

Almost surely, 2^30151421 is an apocalyptic number.

It is an amenable number.

30151421 is a deficient number, since it is larger than the sum of its proper divisors (1773631).

30151421 is a wasteful number, since it uses less digits than its factorization.

30151421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773630.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 30151421 is about 5491.0309596650. The cubic root of 30151421 is about 311.2451515618.

Adding to 30151421 its reverse (12415103), we get a palindrome (42566524).

The spelling of 30151421 in words is "thirty million, one hundred fifty-one thousand, four hundred twenty-one".