21724674722 has 8 divisors (see below), whose sum is σ = 32594035500. Its totient is φ = 10859996224.

The previous prime is 21724674721. The next prime is 21724674821. The reversal of 21724674722 is 22747642712.

It can be written as a sum of positive squares in 2 ways, for example, as 19675392361 + 2049282361 = 140269^2 + 45269^2 .

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

It is a super-2 number, since 2×21724674722² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21724674721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158947 + ... + 1177542.

Almost surely, 2^21724674722 is an apocalyptic number.

21724674722 is a deficient number, since it is larger than the sum of its proper divisors (10869360778).

21724674722 is a wasteful number, since it uses less digits than its factorization.

21724674722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341140.

The product of its digits is 526848, while the sum is 44.

The spelling of 21724674722 in words is "twenty-one billion, seven hundred twenty-four million, six hundred seventy-four thousand, seven hundred twenty-two".