212123112220 has 12 divisors (see below), whose sum is σ = 445458535704. Its totient is φ = 84849244880.

The previous prime is 212123112217. The next prime is 212123112239. The reversal of 212123112220 is 22211321212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303077786 + ... + 5303077825.

It is an arithmetic number, because the mean of its divisors is an integer number (37121544642).

Almost surely, 2^212123112220 is an apocalyptic number.

212123112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212123112220 is an abundant number, since it is smaller than the sum of its proper divisors (233335423484).

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

212123112220 is a wasteful number, since it uses less digits than its factorization.

212123112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606155620 (or 10606155618 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 212123112220 its reverse (22211321212), we get a palindrome (234334433432).

The spelling of 212123112220 in words is "two hundred twelve billion, one hundred twenty-three million, one hundred twelve thousand, two hundred twenty".