21172509422 has 8 divisors (see below), whose sum is σ = 31772525400. Its totient is φ = 10581667624.

The previous prime is 21172509403. The next prime is 21172509431. The reversal of 21172509422 is 22490527112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2287772 + ... + 2297007.

It is an arithmetic number, because the mean of its divisors is an integer number (3971565675).

Almost surely, 2^21172509422 is an apocalyptic number.

21172509422 is a deficient number, since it is larger than the sum of its proper divisors (10600015978).

21172509422 is a wasteful number, since it uses less digits than its factorization.

21172509422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4587090.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21172509422 in words is "twenty-one billion, one hundred seventy-two million, five hundred nine thousand, four hundred twenty-two".