212323131220 has 48 divisors (see below), whose sum is σ = 454935832848. Its totient is φ = 83221401600.

The previous prime is 212323131193. The next prime is 212323131239. The reversal of 212323131220 is 22131323212.

It can be written as a sum of positive squares in 8 ways, for example, as 4720789264 + 207602341956 = 68708^2 + 455634^2 .

It is a super-2 number, since 2×212323131220² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212323131191 and 212323131200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345867 + ... + 737746.

It is an arithmetic number, because the mean of its divisors is an integer number (9477829851).

Almost surely, 2^212323131220 is an apocalyptic number.

212323131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212323131220 is an abundant number, since it is smaller than the sum of its proper divisors (242612701628).

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

212323131220 is a wasteful number, since it uses less digits than its factorization.

212323131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083820 (or 1083818 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 212323131220 its reverse (22131323212), we get a palindrome (234454454432).

The spelling of 212323131220 in words is "two hundred twelve billion, three hundred twenty-three million, one hundred thirty-one thousand, two hundred twenty".