21717067099 has 48 divisors (see below), whose sum is σ = 27829503072. Its totient is φ = 16791570432.

The previous prime is 21717066961. The next prime is 21717067111. The reversal of 21717067099 is 99076071712.

It is not a de Polignac number, because 21717067099 - 2³³ = 13127132507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (21717067699) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9553227 + ... + 9555499.

It is an arithmetic number, because the mean of its divisors is an integer number (579781314).

Almost surely, 2^21717067099 is an apocalyptic number.

21717067099 is a deficient number, since it is larger than the sum of its proper divisors (6112435973).

21717067099 is a wasteful number, since it uses less digits than its factorization.

21717067099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636 (or 2629 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 49.

The spelling of 21717067099 in words is "twenty-one billion, seven hundred seventeen million, sixty-seven thousand, ninety-nine".