21957476551 has 8 divisors (see below), whose sum is σ = 22185424800. Its totient is φ = 21730010400.

The previous prime is 21957476537. The next prime is 21957476617. The reversal of 21957476551 is 15567475912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21957476551 - 2¹¹ = 21957474503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21957476351) 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, 28600 + ... + 211501.

It is an arithmetic number, because the mean of its divisors is an integer number (2773178100).

Almost surely, 2^21957476551 is an apocalyptic number.

21957476551 is a deficient number, since it is larger than the sum of its proper divisors (227948249).

21957476551 is a wasteful number, since it uses less digits than its factorization.

21957476551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241049.

The product of its digits is 2646000, while the sum is 52.

The spelling of 21957476551 in words is "twenty-one billion, nine hundred fifty-seven million, four hundred seventy-six thousand, five hundred fifty-one".