21757058965881 has 24 divisors (see below), whose sum is σ = 33276572151264. Its totient is φ = 13651048920960.

The previous prime is 21757058965877. The next prime is 21757058965909. The reversal of 21757058965881 is 18856985075712.

It is not a de Polignac number, because 21757058965881 - 2² = 21757058965877 is a prime.

It is a super-2 number, since 2×21757058965881² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21757058965781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2518866 + ... + 7061076.

It is an arithmetic number, because the mean of its divisors is an integer number (1386523839636).

Almost surely, 2^{21757058965881} is an apocalyptic number.

It is an amenable number.

21757058965881 is a deficient number, since it is larger than the sum of its proper divisors (11519513185383).

21757058965881 is a wasteful number, since it uses less digits than its factorization.

21757058965881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4573541 (or 4573538 counting only the distinct ones).

The product of its (nonzero) digits is 338688000, while the sum is 72.

The spelling of 21757058965881 in words is "twenty-one trillion, seven hundred fifty-seven billion, fifty-eight million, nine hundred sixty-five thousand, eight hundred eighty-one".