21620157043636 has 24 divisors (see below), whose sum is σ = 38758812523200. Its totient is φ = 10546777460352.

The previous prime is 21620157043613. The next prime is 21620157043637. The reversal of 21620157043636 is 63634075102612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620157043637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70703461 + ... + 71008588.

It is an arithmetic number, because the mean of its divisors is an integer number (1614950521800).

Almost surely, 2^{21620157043636} is an apocalyptic number.

It is an amenable number.

21620157043636 is a deficient number, since it is larger than the sum of its proper divisors (17138655479564).

21620157043636 is a wasteful number, since it uses less digits than its factorization.

21620157043636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141712983 (or 141712981 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 21620157043636 in words is "twenty-one trillion, six hundred twenty billion, one hundred fifty-seven million, forty-three thousand, six hundred thirty-six".