21357616041 has 6 divisors (see below), whose sum is σ = 30849889850. Its totient is φ = 14238410688.

The previous prime is 21357615991. The next prime is 21357616081. The reversal of 21357616041 is 14061675312.

21357616041 is a `hidden beast` number, since 2 + 1 + 35 + 7 + 616 + 0 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20563560000 + 794056041 = 143400^2 + 28179^2 .

It is not a de Polignac number, because 21357616041 - 2²² = 21353421737 is a prime.

It is a super-2 number, since 2×21357616041² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21357615987 and 21357616005.

It is not an unprimeable number, because it can be changed into a prime (21357616081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1186534216 + ... + 1186534233.

Almost surely, 2^21357616041 is an apocalyptic number.

It is an amenable number.

21357616041 is a deficient number, since it is larger than the sum of its proper divisors (9492273809).

21357616041 is a wasteful number, since it uses less digits than its factorization.

21357616041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373068455 (or 2373068452 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21357616041 in words is "twenty-one billion, three hundred fifty-seven million, six hundred sixteen thousand, forty-one".