21867233642 has 32 divisors (see below), whose sum is σ = 34409978064. Its totient is φ = 10412147200.

The previous prime is 21867233611. The next prime is 21867233653. The reversal of 21867233642 is 24633276812.

It can be written as a sum of positive squares in 8 ways, for example, as 13693446361 + 8173787281 = 117019^2 + 90409^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21867233593 and 21867233602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843392 + ... + 868932.

Almost surely, 2^21867233642 is an apocalyptic number.

21867233642 is a deficient number, since it is larger than the sum of its proper divisors (12542744422).

21867233642 is a wasteful number, since it uses less digits than its factorization.

21867233642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25834.

The product of its digits is 580608, while the sum is 44.

The spelling of 21867233642 in words is "twenty-one billion, eight hundred sixty-seven million, two hundred thirty-three thousand, six hundred forty-two".