21131913747152 has 40 divisors (see below), whose sum is σ = 44100030474696. Its totient is φ = 9751536470016.

The previous prime is 21131913747121. The next prime is 21131913747181. The reversal of 21131913747152 is 25174731913112.

It can be written as a sum of positive squares in 4 ways, for example, as 9640925640256 + 11490988106896 = 3104984^2 + 3389836^2 .

It is a super-2 number, since 2×21131913747152² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131913747097 and 21131913747106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7387613 + ... + 9840764.

Almost surely, 2^{21131913747152} is an apocalyptic number.

It is an amenable number.

21131913747152 is an abundant number, since it is smaller than the sum of its proper divisors (22968116727544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131913747152 is a wasteful number, since it uses less digits than its factorization.

21131913747152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17234295 (or 17234289 counting only the distinct ones).

The product of its digits is 317520, while the sum is 47.

The spelling of 21131913747152 in words is "twenty-one trillion, one hundred thirty-one billion, nine hundred thirteen million, seven hundred forty-seven thousand, one hundred fifty-two".