21077542637 has 8 divisors (see below), whose sum is σ = 21199452192. Its totient is φ = 20955841200.

The previous prime is 21077542627. The next prime is 21077542643. The reversal of 21077542637 is 73624577012.

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 21077542637 - 2⁴ = 21077542621 is a prime.

It is a super-2 number, since 2×21077542637² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21077542627) 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, 153443 + ... + 256319.

It is an arithmetic number, because the mean of its divisors is an integer number (2649931524).

Almost surely, 2^21077542637 is an apocalyptic number.

It is an amenable number.

21077542637 is a deficient number, since it is larger than the sum of its proper divisors (121909555).

21077542637 is a wasteful number, since it uses less digits than its factorization.

21077542637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104059.

The product of its (nonzero) digits is 493920, while the sum is 44.

The spelling of 21077542637 in words is "twenty-one billion, seventy-seven million, five hundred forty-two thousand, six hundred thirty-seven".