21013311004 has 24 divisors (see below), whose sum is σ = 42211774080. Its totient is φ = 8966029296.

The previous prime is 21013311001. The next prime is 21013311029. The reversal of 21013311004 is 40011331012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013311001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1646674 + ... + 1659385.

It is an arithmetic number, because the mean of its divisors is an integer number (1758823920).

Almost surely, 2^21013311004 is an apocalyptic number.

It is an amenable number.

21013311004 is an abundant number, since it is smaller than the sum of its proper divisors (21198463076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21013311004 is a wasteful number, since it uses less digits than its factorization.

21013311004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306297 (or 3306295 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21013311004 its reverse (40011331012), we get a palindrome (61024642016).

The spelling of 21013311004 in words is "twenty-one billion, thirteen million, three hundred eleven thousand, four".