21694445955 has 288 divisors, whose sum is σ = 50477394240. Its totient is φ = 8517519360.

The previous prime is 21694445939. The next prime is 21694445987. The reversal of 21694445955 is 55954449612.

It is a happy number.

21694445955 is a `hidden beast` number, since 2 + 1 + 6 + 9 + 4 + 44 + 595 + 5 = 666.

It is not a de Polignac number, because 21694445955 - 2⁴ = 21694445939 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 33222409 + ... + 33223061.

It is an arithmetic number, because the mean of its divisors is an integer number (175268730).

Almost surely, 2^21694445955 is an apocalyptic number.

21694445955 is an abundant number, since it is smaller than the sum of its proper divisors (28782948285).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21694445955 is a wasteful number, since it uses less digits than its factorization.

21694445955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 761 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The spelling of 21694445955 in words is "twenty-one billion, six hundred ninety-four million, four hundred forty-five thousand, nine hundred fifty-five".