21627557271 has 48 divisors (see below), whose sum is σ = 33372518400. Its totient is φ = 13465267200.

The previous prime is 21627557269. The next prime is 21627557279. The reversal of 21627557271 is 17275572612.

21627557271 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 7 + 5 + 572 + 71 = 666.

It is not a de Polignac number, because 21627557271 - 2¹ = 21627557269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21627557279) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4365846 + ... + 4370796.

It is an arithmetic number, because the mean of its divisors is an integer number (695260800).

Almost surely, 2^21627557271 is an apocalyptic number.

21627557271 is a deficient number, since it is larger than the sum of its proper divisors (11744961129).

21627557271 is a wasteful number, since it uses less digits than its factorization.

21627557271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5476 (or 5473 counting only the distinct ones).

The product of its digits is 411600, while the sum is 45.

The spelling of 21627557271 in words is "twenty-one billion, six hundred twenty-seven million, five hundred fifty-seven thousand, two hundred seventy-one".