216918172921422 has 64 divisors (see below), whose sum is σ = 504221730969600. Its totient is φ = 60925546777440.

The previous prime is 216918172921409. The next prime is 216918172921459. The reversal of 216918172921422 is 224129271819612.

It is a super-2 number, since 2×216918172921422² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276596797 + ... + 277379927.

It is an arithmetic number, because the mean of its divisors is an integer number (7878464546400).

Almost surely, 2^{216918172921422} is an apocalyptic number.

216918172921422 is an abundant number, since it is smaller than the sum of its proper divisors (287303558048178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216918172921422 is a wasteful number, since it uses less digits than its factorization.

216918172921422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894981.

The product of its digits is 3483648, while the sum is 57.

The spelling of 216918172921422 in words is "two hundred sixteen trillion, nine hundred eighteen billion, one hundred seventy-two million, nine hundred twenty-one thousand, four hundred twenty-two".