21321331012 has 24 divisors (see below), whose sum is σ = 37649126592. Its totient is φ = 10564663200.

The previous prime is 21321330977. The next prime is 21321331091. The reversal of 21321331012 is 21013312312.

It is a super-2 number, since 2×21321331012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356337 + ... + 411847.

It is an arithmetic number, because the mean of its divisors is an integer number (1568713608).

Almost surely, 2^21321331012 is an apocalyptic number.

It is an amenable number.

21321331012 is a deficient number, since it is larger than the sum of its proper divisors (16327795580).

21321331012 is a wasteful number, since it uses less digits than its factorization.

21321331012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56379 (or 56377 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21321331012 its reverse (21013312312), we get a palindrome (42334643324).

It can be divided in two parts, 2132133 and 1012, that added together give a triangular number (2133145 = T₂₀₆₅).

The spelling of 21321331012 in words is "twenty-one billion, three hundred twenty-one million, three hundred thirty-one thousand, twelve".