1213131020 has 12 divisors (see below), whose sum is σ = 2547575184. Its totient is φ = 485252400.

The previous prime is 1213130983. The next prime is 1213131041. The reversal of 1213131020 is 201313121.

It is a junction number, because it is equal to n+sod(n) for n = 1213130986 and 1213131004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30328256 + ... + 30328295.

It is an arithmetic number, because the mean of its divisors is an integer number (212297932).

Almost surely, 2^1213131020 is an apocalyptic number.

1213131020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213131020 is an abundant number, since it is smaller than the sum of its proper divisors (1334444164).

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

1213131020 is a wasteful number, since it uses less digits than its factorization.

1213131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60656560 (or 60656558 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1213131020 is about 34830.0304335210. The cubic root of 1213131020 is about 1066.5205696173.

Adding to 1213131020 its reverse (201313121), we get a palindrome (1414444141).

The spelling of 1213131020 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, twenty".