1213213131220 has 24 divisors (see below), whose sum is σ = 2548032013800. Its totient is φ = 485231073792.

The previous prime is 1213213131203. The next prime is 1213213131371. The reversal of 1213213131220 is 221313123121.

It can be written as a sum of positive squares in 4 ways, for example, as 4299687184 + 1208913444036 = 65572^2 + 1099506^2 .

It is a super-2 number, since 2×1213213131220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213213131191 and 1213213131200.

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, 3202305 + ... + 3561064.

It is an arithmetic number, because the mean of its divisors is an integer number (106168000575).

Almost surely, 2^{1213213131220} is an apocalyptic number.

1213213131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213213131220 is an abundant number, since it is smaller than the sum of its proper divisors (1334818882580).

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

1213213131220 is a wasteful number, since it uses less digits than its factorization.

1213213131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772347 (or 6772345 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1213213131220 its reverse (221313123121), we get a palindrome (1434526254341).

The spelling of 1213213131220 in words is "one trillion, two hundred thirteen billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred twenty".