21172892611 has 8 divisors (see below), whose sum is σ = 24001659920. Its totient is φ = 18515565792.

The previous prime is 21172892579. The next prime is 21172892623. The reversal of 21172892611 is 11629827112.

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 21172892611 - 2⁵ = 21172892579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21172892011) 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, 42859860 + ... + 42860353.

It is an arithmetic number, because the mean of its divisors is an integer number (3000207490).

Almost surely, 2^21172892611 is an apocalyptic number.

21172892611 is a deficient number, since it is larger than the sum of its proper divisors (2828767309).

21172892611 is a wasteful number, since it uses less digits than its factorization.

21172892611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85720245.

The product of its digits is 24192, while the sum is 40.

The spelling of 21172892611 in words is "twenty-one billion, one hundred seventy-two million, eight hundred ninety-two thousand, six hundred eleven".