2166221655224 has 32 divisors (see below), whose sum is σ = 4583697865200. Its totient is φ = 950692888320.

The previous prime is 2166221655211. The next prime is 2166221655337. The reversal of 2166221655224 is 4225561226612.

It is a super-2 number, since 2×2166221655224² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424413917 + ... + 424419020.

Almost surely, 2^{2166221655224} is an apocalyptic number.

It is an amenable number.

2166221655224 is an abundant number, since it is smaller than the sum of its proper divisors (2417476209976).

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

2166221655224 is a wasteful number, since it uses less digits than its factorization.

2166221655224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848832983 (or 848832979 counting only the distinct ones).

The product of its digits is 691200, while the sum is 44.

The spelling of 2166221655224 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-one million, six hundred fifty-five thousand, two hundred twenty-four".