21868616044 has 18 divisors (see below), whose sum is σ = 42065458652. Its totient is φ = 9940279800.

The previous prime is 21868616017. The next prime is 21868616069. The reversal of 21868616044 is 44061686812.

It is a junction number, because it is equal to n+sod(n) for n = 21868615985 and 21868616003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22591062 + ... + 22592029.

Almost surely, 2^21868616044 is an apocalyptic number.

It is an amenable number.

21868616044 is a deficient number, since it is larger than the sum of its proper divisors (20196842608).

21868616044 is a wasteful number, since it uses less digits than its factorization.

21868616044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45183117 (or 45183104 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 21868616044 in words is "twenty-one billion, eight hundred sixty-eight million, six hundred sixteen thousand, forty-four".