21137574261 has 24 divisors (see below), whose sum is σ = 28879714080. Its totient is φ = 13750721952.

The previous prime is 21137574229. The next prime is 21137574343. The reversal of 21137574261 is 16247573112.

It is not a de Polignac number, because 21137574261 - 2⁵ = 21137574229 is a prime.

It is a super-2 number, since 2×21137574261² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137574221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1433635 + ... + 1448303.

It is an arithmetic number, because the mean of its divisors is an integer number (1203321420).

Almost surely, 2^21137574261 is an apocalyptic number.

It is an amenable number.

21137574261 is a deficient number, since it is larger than the sum of its proper divisors (7742139819).

21137574261 is a wasteful number, since it uses less digits than its factorization.

21137574261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14913 (or 14846 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The spelling of 21137574261 in words is "twenty-one billion, one hundred thirty-seven million, five hundred seventy-four thousand, two hundred sixty-one".