2164512220 has 24 divisors (see below), whose sum is σ = 4895128224. Its totient is φ = 799204416.

The previous prime is 2164512193. The next prime is 2164512239. The reversal of 2164512220 is 222154612.

It is a super-2 number, since 2×2164512220² = 9370226301058656800, which 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 7 ways as a sum of consecutive naturals, for example, 4162264 + ... + 4162783.

It is an arithmetic number, because the mean of its divisors is an integer number (203963676).

Almost surely, 2^2164512220 is an apocalyptic number.

2164512220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2164512220 is an abundant number, since it is smaller than the sum of its proper divisors (2730616004).

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

2164512220 is a wasteful number, since it uses less digits than its factorization.

2164512220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325069 (or 8325067 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2164512220 is about 46524.3185871647. The cubic root of 2164512220 is about 1293.5603067894.

Adding to 2164512220 its reverse (222154612), we get a palindrome (2386666832).

The spelling of 2164512220 in words is "two billion, one hundred sixty-four million, five hundred twelve thousand, two hundred twenty".