21031431000136 has 16 divisors (see below), whose sum is σ = 41753576250540. Its totient is φ = 9897144000000.

The previous prime is 21031431000101. The next prime is 21031431000157. The reversal of 21031431000136 is 63100013413012.

It can be written as a sum of positive squares in 2 ways, for example, as 19918815302500 + 1112615697636 = 4463050^2 + 1054806^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21031431000136.

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, 77321437365 + ... + 77321437636.

Almost surely, 2^{21031431000136} is an apocalyptic number.

It is an amenable number.

21031431000136 is a deficient number, since it is larger than the sum of its proper divisors (20722145250404).

21031431000136 is a wasteful number, since it uses less digits than its factorization.

21031431000136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154642875024 (or 154642875020 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21031431000136 its reverse (63100013413012), we get a palindrome (84131444413148).

The spelling of 21031431000136 in words is "twenty-one trillion, thirty-one billion, four hundred thirty-one million, one hundred thirty-six", and thus it is an aban number.