21227131504 has 10 divisors (see below), whose sum is σ = 41127567320. Its totient is φ = 10613565744.

The previous prime is 21227131489. The next prime is 21227131517. The reversal of 21227131504 is 40513172212.

It is a super-2 number, since 2×21227131504² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663347844 + ... + 663347875.

It is an arithmetic number, because the mean of its divisors is an integer number (4112756732).

Almost surely, 2^21227131504 is an apocalyptic number.

It is an amenable number.

21227131504 is a deficient number, since it is larger than the sum of its proper divisors (19900435816).

21227131504 is a wasteful number, since it uses less digits than its factorization.

21227131504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326695727 (or 1326695721 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 21227131504 in words is "twenty-one billion, two hundred twenty-seven million, one hundred thirty-one thousand, five hundred four".