21072631177 has 8 divisors (see below), whose sum is σ = 22704222464. Its totient is φ = 19442557008.

The previous prime is 21072631147. The next prime is 21072631243. The reversal of 21072631177 is 77113627012.

It is a happy number.

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 21072631177 - 2¹⁹ = 21072106889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21072631147) 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, 350343 + ... + 406060.

It is an arithmetic number, because the mean of its divisors is an integer number (2838027808).

Almost surely, 2^21072631177 is an apocalyptic number.

It is an amenable number.

21072631177 is a deficient number, since it is larger than the sum of its proper divisors (1631591287).

21072631177 is a wasteful number, since it uses less digits than its factorization.

21072631177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758559.

The product of its (nonzero) digits is 24696, while the sum is 37.

The spelling of 21072631177 in words is "twenty-one billion, seventy-two million, six hundred thirty-one thousand, one hundred seventy-seven".