21500261154604 has 24 divisors (see below), whose sum is σ = 38925526903200. Its totient is φ = 10378732331520.

The previous prime is 21500261154571. The next prime is 21500261154623. The reversal of 21500261154604 is 40645116200512.

It is a super-2 number, since 2×21500261154604² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4567077 + ... + 7991164.

It is an arithmetic number, because the mean of its divisors is an integer number (1621896954300).

Almost surely, 2^{21500261154604} is an apocalyptic number.

It is an amenable number.

21500261154604 is a deficient number, since it is larger than the sum of its proper divisors (17425265748596).

21500261154604 is a wasteful number, since it uses less digits than its factorization.

21500261154604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12573033 (or 12573031 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 21500261154604 in words is "twenty-one trillion, five hundred billion, two hundred sixty-one million, one hundred fifty-four thousand, six hundred four".