21985442674 has 16 divisors (see below), whose sum is σ = 35518475160. Its totient is φ = 10146119040.

The previous prime is 21985442663. The next prime is 21985442701. The reversal of 21985442674 is 47624458912.

It can be written as a sum of positive squares in 4 ways, for example, as 21975987049 + 9455625 = 148243^2 + 3075^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267744 + ... + 340084.

Almost surely, 2^21985442674 is an apocalyptic number.

21985442674 is a deficient number, since it is larger than the sum of its proper divisors (13533032486).

21985442674 is a wasteful number, since it uses less digits than its factorization.

21985442674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84045.

The product of its digits is 3870720, while the sum is 52.

The spelling of 21985442674 in words is "twenty-one billion, nine hundred eighty-five million, four hundred forty-two thousand, six hundred seventy-four".