21755254704 has 40 divisors (see below), whose sum is σ = 56209944000. Its totient is φ = 7250607168.

The previous prime is 21755254663. The next prime is 21755254721. The reversal of 21755254704 is 40745255712.

It is a super-2 number, since 2×21755254704² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 305047 + ... + 369545.

It is an arithmetic number, because the mean of its divisors is an integer number (1405248600).

Almost surely, 2^21755254704 is an apocalyptic number.

21755254704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21755254704 is an abundant number, since it is smaller than the sum of its proper divisors (34454689296).

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

21755254704 is a wasteful number, since it uses less digits than its factorization.

21755254704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71537 (or 71531 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 42.

The spelling of 21755254704 in words is "twenty-one billion, seven hundred fifty-five million, two hundred fifty-four thousand, seven hundred four".