21507470050417 has 12 divisors (see below), whose sum is σ = 23515262269824. Its totient is φ = 19660301210160.

The previous prime is 21507470050333. The next prime is 21507470050427. The reversal of 21507470050417 is 71405007470512.

It is not a de Polignac number, because 21507470050417 - 2⁷ = 21507470050289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21507470050427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 617764809 + ... + 617799622.

It is an arithmetic number, because the mean of its divisors is an integer number (1959605189152).

Almost surely, 2^{21507470050417} is an apocalyptic number.

It is an amenable number.

21507470050417 is a deficient number, since it is larger than the sum of its proper divisors (2007792219407).

21507470050417 is a wasteful number, since it uses less digits than its factorization.

21507470050417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235564560 (or 1235564547 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 43.

The spelling of 21507470050417 in words is "twenty-one trillion, five hundred seven billion, four hundred seventy million, fifty thousand, four hundred seventeen".