21331021030 has 24 divisors (see below), whose sum is σ = 42203691936. Its totient is φ = 7756734480.

The previous prime is 21331020967. The next prime is 21331021073. The reversal of 21331021030 is 3012013312.

It is a junction number, because it is equal to n+sod(n) for n = 21331020995 and 21331021013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8813262 + ... + 8815681.

It is an arithmetic number, because the mean of its divisors is an integer number (1758487164).

Almost surely, 2^21331021030 is an apocalyptic number.

21331021030 is a deficient number, since it is larger than the sum of its proper divisors (20872670906).

21331021030 is a wasteful number, since it uses less digits than its factorization.

21331021030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17628972 (or 17628961 counting only the distinct ones).

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

Adding to 21331021030 its reverse (3012013312), we get a palindrome (24343034342).

The spelling of 21331021030 in words is "twenty-one billion, three hundred thirty-one million, twenty-one thousand, thirty".