21753408897 has 32 divisors (see below), whose sum is σ = 35268082560. Its totient is φ = 13142237760.

The previous prime is 21753408893. The next prime is 21753408907. The reversal of 21753408897 is 79880435712.

It is a happy number.

21753408897 is a `hidden beast` number, since 2 + 17 + 534 + 0 + 8 + 8 + 97 = 666.

It is not a de Polignac number, because 21753408897 - 2² = 21753408893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21753408893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21378 + ... + 209675.

It is an arithmetic number, because the mean of its divisors is an integer number (1102127580).

Almost surely, 2^21753408897 is an apocalyptic number.

21753408897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21753408897 is a deficient number, since it is larger than the sum of its proper divisors (13514673663).

21753408897 is a wasteful number, since it uses less digits than its factorization.

21753408897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231390 (or 231384 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 21753408897 in words is "twenty-one billion, seven hundred fifty-three million, four hundred eight thousand, eight hundred ninety-seven".