21617752227 has 16 divisors (see below), whose sum is σ = 30350112000. Its totient is φ = 13649084064.

The previous prime is 21617752129. The next prime is 21617752237. The reversal of 21617752227 is 72225771612.

It is a happy number.

It is not a de Polignac number, because 21617752227 - 2⁸ = 21617751971 is a prime.

It is a super-2 number, since 2×21617752227² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21617752237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132049 + ... + 246317.

It is an arithmetic number, because the mean of its divisors is an integer number (1896882000).

Almost surely, 2^21617752227 is an apocalyptic number.

21617752227 is a deficient number, since it is larger than the sum of its proper divisors (8732359773).

21617752227 is a wasteful number, since it uses less digits than its factorization.

21617752227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117610.

The product of its digits is 164640, while the sum is 42.

The spelling of 21617752227 in words is "twenty-one billion, six hundred seventeen million, seven hundred fifty-two thousand, two hundred twenty-seven".