1213311131220 has 96 divisors (see below), whose sum is σ = 3500249034240. Its totient is φ = 313833456640.

The previous prime is 1213311131107. The next prime is 1213311131233. The reversal of 1213311131220 is 221311133121.

It is a super-2 number, since 2×1213311131220² (a number of 25 digits) 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 31 ways as a sum of consecutive naturals, for example, 999900 + ... + 1851059.

It is an arithmetic number, because the mean of its divisors is an integer number (36460927440).

Almost surely, 2^{1213311131220} is an apocalyptic number.

1213311131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213311131220 is an abundant number, since it is smaller than the sum of its proper divisors (2286937903020).

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

1213311131220 is a wasteful number, since it uses less digits than its factorization.

1213311131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851185 (or 2851183 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1213311131220 its reverse (221311133121), we get a palindrome (1434622264341).

The spelling of 1213311131220 in words is "one trillion, two hundred thirteen billion, three hundred eleven million, one hundred thirty-one thousand, two hundred twenty".