2166220531332 has 72 divisors (see below), whose sum is σ = 6433018562880. Its totient is φ = 605935811520.

The previous prime is 2166220531331. The next prime is 2166220531357. The reversal of 2166220531332 is 2331350226612.

2166220531332 is a `hidden beast` number, since 2 + 16 + 62 + 20 + 531 + 3 + 32 = 666.

It is a super-2 number, since 2×2166220531332² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2166220531331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210389232 + ... + 210399527.

It is an arithmetic number, because the mean of its divisors is an integer number (89347480040).

Almost surely, 2^{2166220531332} is an apocalyptic number.

2166220531332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2166220531332 is an abundant number, since it is smaller than the sum of its proper divisors (4266798031548).

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

2166220531332 is a wasteful number, since it uses less digits than its factorization.

2166220531332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420788793 (or 420788788 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 2166220531332 its reverse (2331350226612), we get a palindrome (4497570757944).

The spelling of 2166220531332 in words is "two trillion, one hundred sixty-six billion, two hundred twenty million, five hundred thirty-one thousand, three hundred thirty-two".