212431023220 has 24 divisors (see below), whose sum is σ = 480420930024. Its totient is φ = 78436070016.

The previous prime is 212431023169. The next prime is 212431023239. The reversal of 212431023220 is 22320134212.

It can be written as a sum of positive squares in 4 ways, for example, as 12310790116 + 200120233104 = 110954^2 + 447348^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212431023191 and 212431023200.

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, 408520939 + ... + 408521458.

It is an arithmetic number, because the mean of its divisors is an integer number (20017538751).

Almost surely, 2^212431023220 is an apocalyptic number.

212431023220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212431023220 is an abundant number, since it is smaller than the sum of its proper divisors (267989906804).

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

212431023220 is a wasteful number, since it uses less digits than its factorization.

212431023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817042419 (or 817042417 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 212431023220 its reverse (22320134212), we get a palindrome (234751157432).

The spelling of 212431023220 in words is "two hundred twelve billion, four hundred thirty-one million, twenty-three thousand, two hundred twenty".