21903964994 has 8 divisors (see below), whose sum is σ = 32980875840. Its totient is φ = 10910339716.

The previous prime is 21903964991. The next prime is 21903965003. The reversal of 21903964994 is 49946930912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21903964991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20820734 + ... + 20821785.

It is an arithmetic number, because the mean of its divisors is an integer number (4122609480).

Almost surely, 2^21903964994 is an apocalyptic number.

21903964994 is a deficient number, since it is larger than the sum of its proper divisors (11076910846).

21903964994 is a wasteful number, since it uses less digits than its factorization.

21903964994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41642784.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The spelling of 21903964994 in words is "twenty-one billion, nine hundred three million, nine hundred sixty-four thousand, nine hundred ninety-four".