21272122602 has 24 divisors (see below), whose sum is σ = 46149563460. Its totient is φ = 7081482240.

The previous prime is 21272122579. The next prime is 21272122603. The reversal of 21272122602 is 20622127212.

21272122602 is a `hidden beast` number, since 2 + 12 + 7 + 21 + 22 + 602 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20235347001 + 1036775601 = 142251^2 + 32199^2 .

It is not an unprimeable number, because it can be changed into a prime (21272122603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754549 + ... + 782232.

Almost surely, 2^21272122602 is an apocalyptic number.

21272122602 is an abundant number, since it is smaller than the sum of its proper divisors (24877440858).

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

21272122602 is a wasteful number, since it uses less digits than its factorization.

21272122602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537558 (or 1537555 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 21272122602 its reverse (20622127212), we get a palindrome (41894249814).

The spelling of 21272122602 in words is "twenty-one billion, two hundred seventy-two million, one hundred twenty-two thousand, six hundred two".