21694445954 has 32 divisors (see below), whose sum is σ = 33205648896. Its totient is φ = 10628674560.

The previous prime is 21694445939. The next prime is 21694445987. The reversal of 21694445954 is 45954449612.

It is a junction number, because it is equal to n+sod(n) for n = 21694445896 and 21694445905.

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, 9102647 + ... + 9105029.

It is an arithmetic number, because the mean of its divisors is an integer number (1037676528).

Almost surely, 2^21694445954 is an apocalyptic number.

21694445954 is a deficient number, since it is larger than the sum of its proper divisors (11511202942).

21694445954 is a wasteful number, since it uses less digits than its factorization.

21694445954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930.

The product of its digits is 6220800, while the sum is 53.

The spelling of 21694445954 in words is "twenty-one billion, six hundred ninety-four million, four hundred forty-five thousand, nine hundred fifty-four".