21222537634 has 8 divisors (see below), whose sum is σ = 31913193708. Its totient is φ = 10584806400.

The previous prime is 21222537613. The next prime is 21222537683. The reversal of 21222537634 is 43673522212.

21222537634 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12847542409 + 8374995225 = 113347^2 + 91515^2 .

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

It is a super-2 number, since 2×21222537634² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222537593 and 21222537602.

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, 13230207 + ... + 13231810.

Almost surely, 2^21222537634 is an apocalyptic number.

21222537634 is a deficient number, since it is larger than the sum of its proper divisors (10690656074).

21222537634 is a wasteful number, since it uses less digits than its factorization.

21222537634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26462420.

The product of its digits is 120960, while the sum is 37.

The spelling of 21222537634 in words is "twenty-one billion, two hundred twenty-two million, five hundred thirty-seven thousand, six hundred thirty-four".