21179620252 has 36 divisors (see below), whose sum is σ = 43234718800. Its totient is φ = 9074669856.

The previous prime is 21179620213. The next prime is 21179620309. The reversal of 21179620252 is 25202697112.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5388624 + ... + 5392552.

Almost surely, 2^21179620252 is an apocalyptic number.

It is an amenable number.

21179620252 is an abundant number, since it is smaller than the sum of its proper divisors (22055098548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21179620252 is an frugal number, since it uses more digits than its factorization.

21179620252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7883 (or 3938 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 21179620252 in words is "twenty-one billion, one hundred seventy-nine million, six hundred twenty thousand, two hundred fifty-two".