30521421 has 32 divisors (see below), whose sum is σ = 52039680. Its totient is φ = 17318448.

The previous prime is 30521389. The next prime is 30521459. The reversal of 30521421 is 12412503.

It is not a de Polignac number, because 30521421 - 2⁵ = 30521389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30521394 and 30521403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30521461) 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 31 ways as a sum of consecutive naturals, for example, 31080 + ... + 32046.

It is an arithmetic number, because the mean of its divisors is an integer number (1626240).

Almost surely, 2^30521421 is an apocalyptic number.

It is an amenable number.

30521421 is a deficient number, since it is larger than the sum of its proper divisors (21518259).

30521421 is a wasteful number, since it uses less digits than its factorization.

30521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 1144 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 30521421 is about 5524.6195344114. The cubic root of 30521421 is about 312.5131164628.

Adding to 30521421 its reverse (12412503), we get a palindrome (42933924).

The spelling of 30521421 in words is "thirty million, five hundred twenty-one thousand, four hundred twenty-one".