21261385037324 has 12 divisors (see below), whose sum is σ = 38114921957448. Its totient is φ = 10371407335200.

The previous prime is 21261385037287. The next prime is 21261385037329. The reversal of 21261385037324 is 42373058316212.

It is not an unprimeable number, because it can be changed into a prime (21261385037329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64821295682 + ... + 64821296009.

It is an arithmetic number, because the mean of its divisors is an integer number (3176243496454).

Almost surely, 2^{21261385037324} is an apocalyptic number.

It is an amenable number.

21261385037324 is a deficient number, since it is larger than the sum of its proper divisors (16853536920124).

21261385037324 is a wasteful number, since it uses less digits than its factorization.

21261385037324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129642591736 (or 129642591734 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 21261385037324 in words is "twenty-one trillion, two hundred sixty-one billion, three hundred eighty-five million, thirty-seven thousand, three hundred twenty-four".