21260531502436 has 48 divisors (see below), whose sum is σ = 37854436257792. Its totient is φ = 10445768704800.

The previous prime is 21260531502367. The next prime is 21260531502437. The reversal of 21260531502436 is 63420513506212.

It is not an unprimeable number, because it can be changed into a prime (21260531502437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1539830245 + ... + 1539844051.

It is an arithmetic number, because the mean of its divisors is an integer number (788634088704).

Almost surely, 2^{21260531502436} is an apocalyptic number.

It is an amenable number.

21260531502436 is a deficient number, since it is larger than the sum of its proper divisors (16593904755356).

21260531502436 is a wasteful number, since it uses less digits than its factorization.

21260531502436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27640 (or 27638 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 21260531502436 in words is "twenty-one trillion, two hundred sixty billion, five hundred thirty-one million, five hundred two thousand, four hundred thirty-six".