21735945944 has 32 divisors (see below), whose sum is σ = 42594474240. Its totient is φ = 10378922400.

The previous prime is 21735945929. The next prime is 21735946007. The reversal of 21735945944 is 44954953712.

It is a super-2 number, since 2×21735945944² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 22499 + ... + 209709.

It is an arithmetic number, because the mean of its divisors is an integer number (1331077320).

Almost surely, 2^21735945944 is an apocalyptic number.

It is an amenable number.

21735945944 is a deficient number, since it is larger than the sum of its proper divisors (20858528296).

21735945944 is a wasteful number, since it uses less digits than its factorization.

21735945944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187871 (or 187867 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 53.

The spelling of 21735945944 in words is "twenty-one billion, seven hundred thirty-five million, nine hundred forty-five thousand, nine hundred forty-four".