21231331012 has 48 divisors (see below), whose sum is σ = 38737702080. Its totient is φ = 10173437568.

The previous prime is 21231330971. The next prime is 21231331021. The reversal of 21231331012 is 21013313212.

It is a super-2 number, since 2×21231331012² (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 15 ways as a sum of consecutive naturals, for example, 6219018 + ... + 6222430.

It is an arithmetic number, because the mean of its divisors is an integer number (807035460).

Almost surely, 2^21231331012 is an apocalyptic number.

It is an amenable number.

21231331012 is a deficient number, since it is larger than the sum of its proper divisors (17506371068).

21231331012 is a wasteful number, since it uses less digits than its factorization.

21231331012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132 (or 4130 counting only the distinct ones).

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

Adding to 21231331012 its reverse (21013313212), we get a palindrome (42244644224).

The spelling of 21231331012 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-one thousand, twelve".