21310131212 has 12 divisors (see below), whose sum is σ = 38914152816. Its totient is φ = 10191801840.

The previous prime is 21310131181. The next prime is 21310131289. The reversal of 21310131212 is 21213101312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115815839 + ... + 115816022.

It is an arithmetic number, because the mean of its divisors is an integer number (3242846068).

Almost surely, 2^21310131212 is an apocalyptic number.

It is an amenable number.

21310131212 is a deficient number, since it is larger than the sum of its proper divisors (17604021604).

21310131212 is a wasteful number, since it uses less digits than its factorization.

21310131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231631888 (or 231631886 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21310131212 its reverse (21213101312), we get a palindrome (42523232524).

The spelling of 21310131212 in words is "twenty-one billion, three hundred ten million, one hundred thirty-one thousand, two hundred twelve".