2166223231220 has 24 divisors (see below), whose sum is σ = 4595966406024. Its totient is φ = 857556412416.

The previous prime is 2166223231217. The next prime is 2166223231231. The reversal of 2166223231220 is 221323226612.

It can be written as a sum of positive squares in 4 ways, for example, as 3005890276 + 2163217340944 = 54826^2 + 1470788^2 .

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, 558303017 + ... + 558306896.

It is an arithmetic number, because the mean of its divisors is an integer number (191498600251).

Almost surely, 2^{2166223231220} is an apocalyptic number.

2166223231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166223231220 is an abundant number, since it is smaller than the sum of its proper divisors (2429743174804).

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

2166223231220 is a wasteful number, since it uses less digits than its factorization.

2166223231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116610019 (or 1116610017 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 2166223231220 its reverse (221323226612), we get a palindrome (2387546457832).

The spelling of 2166223231220 in words is "two trillion, one hundred sixty-six billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty".