21334056616 has 32 divisors (see below), whose sum is σ = 40433720040. Its totient is φ = 10551840768.

The previous prime is 21334056607. The next prime is 21334056637. The reversal of 21334056616 is 61665043312.

It can be written as a sum of positive squares in 4 ways, for example, as 16172208900 + 5161847716 = 127170^2 + 71846^2 .

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, 1913490 + ... + 1924606.

Almost surely, 2^21334056616 is an apocalyptic number.

It is an amenable number.

21334056616 is a deficient number, since it is larger than the sum of its proper divisors (19099663424).

21334056616 is a wasteful number, since it uses less digits than its factorization.

21334056616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13693 (or 13689 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 21334056616 its reverse (61665043312), we get a palindrome (82999099928).

The spelling of 21334056616 in words is "twenty-one billion, three hundred thirty-four million, fifty-six thousand, six hundred sixteen".