21311131312 has 10 divisors (see below), whose sum is σ = 41290316948. Its totient is φ = 10655565648.

The previous prime is 21311131307. The next prime is 21311131343. The reversal of 21311131312 is 21313111312.

It is a self number, because there is not a number n which added to its sum of digits gives 21311131312.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665972838 + ... + 665972869.

Almost surely, 2^21311131312 is an apocalyptic number.

It is an amenable number.

21311131312 is a deficient number, since it is larger than the sum of its proper divisors (19979185636).

21311131312 is a wasteful number, since it uses less digits than its factorization.

21311131312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331945715 (or 1331945709 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

Adding to 21311131312 its reverse (21313111312), we get a palindrome (42624242624).

The spelling of 21311131312 in words is "twenty-one billion, three hundred eleven million, one hundred thirty-one thousand, three hundred twelve".