1213011131220 has 144 divisors (see below), whose sum is σ = 4264332403968. Its totient is φ = 273354600960.

The previous prime is 1213011131219. The next prime is 1213011131221. The reversal of 1213011131220 is 221311103121.

1213011131220 is a `hidden beast` number, since 1 + 21 + 301 + 11 + 312 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1213011131219) and next prime (1213011131221).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1213011131193 and 1213011131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213011131221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6690169 + ... + 6869088.

It is an arithmetic number, because the mean of its divisors is an integer number (29613419472).

Almost surely, 2^{1213011131220} is an apocalyptic number.

1213011131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213011131220 is an abundant number, since it is smaller than the sum of its proper divisors (3051321272748).

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

1213011131220 is a wasteful number, since it uses less digits than its factorization.

1213011131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13559350 (or 13559345 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1213011131220 its reverse (221311103121), we get a palindrome (1434322234341).

It can be divided in two parts, 121301 and 1131220, that added together give a palindrome (1252521).

The spelling of 1213011131220 in words is "one trillion, two hundred thirteen billion, eleven million, one hundred thirty-one thousand, two hundred twenty".