21611442074 has 16 divisors (see below), whose sum is σ = 33355842120. Its totient is φ = 10496865600.

The previous prime is 21611442059. The next prime is 21611442101. The reversal of 21611442074 is 47024411612.

It can be written as a sum of positive squares in 4 ways, for example, as 21072877225 + 538564849 = 145165^2 + 23207^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21611442074.

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, 998609 + ... + 1020020.

Almost surely, 2^21611442074 is an apocalyptic number.

21611442074 is a deficient number, since it is larger than the sum of its proper divisors (11744400046).

21611442074 is a wasteful number, since it uses less digits than its factorization.

21611442074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018785.

The product of its (nonzero) digits is 10752, while the sum is 32.

Adding to 21611442074 its reverse (47024411612), we get a palindrome (68635853686).

The spelling of 21611442074 in words is "twenty-one billion, six hundred eleven million, four hundred forty-two thousand, seventy-four".