30331021021 has 12 divisors (see below), whose sum is σ = 35679468060. Its totient is φ = 25705901760.

The previous prime is 30331021003. The next prime is 30331021027. The reversal of 30331021021 is 12012013303.

It can be written as a sum of positive squares in 2 ways, for example, as 4059473796 + 26271547225 = 63714^2 + 162085^2 .

It is not a de Polignac number, because 30331021021 - 2¹⁵ = 30330988253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30331020986 and 30331021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30331021027) 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 11 ways as a sum of consecutive naturals, for example, 3473170 + ... + 3481891.

It is an arithmetic number, because the mean of its divisors is an integer number (2973289005).

Almost surely, 2^30331021021 is an apocalyptic number.

It is an amenable number.

30331021021 is a deficient number, since it is larger than the sum of its proper divisors (5348447039).

30331021021 is an equidigital number, since it uses as much as digits as its factorization.

30331021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6955164 (or 6955157 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 30331021021 its reverse (12012013303), we get a palindrome (42343034324).

The spelling of 30331021021 in words is "thirty billion, three hundred thirty-one million, twenty-one thousand, twenty-one".