30521421021 has 32 divisors (see below), whose sum is σ = 50097293568. Its totient is φ = 16095720960.

The previous prime is 30521421013. The next prime is 30521421041. The reversal of 30521421021 is 12012412503.

It is not a de Polignac number, because 30521421021 - 2³ = 30521421013 is a prime.

It is a super-2 number, since 2×30521421021² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30521421011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1682761 + ... + 1700801.

It is an arithmetic number, because the mean of its divisors is an integer number (1565540424).

Almost surely, 2^30521421021 is an apocalyptic number.

It is an amenable number.

30521421021 is a deficient number, since it is larger than the sum of its proper divisors (19575872547).

30521421021 is a wasteful number, since it uses less digits than its factorization.

30521421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24261.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 30521421021 its reverse (12012412503), we get a palindrome (42533833524).

The spelling of 30521421021 in words is "thirty billion, five hundred twenty-one million, four hundred twenty-one thousand, twenty-one".