1213131234 has 32 divisors (see below), whose sum is σ = 2776427136. Its totient is φ = 346164480.

The previous prime is 1213131223. The next prime is 1213131281. The reversal of 1213131234 is 4321313121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213131234.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15354 + ... + 51594.

It is an arithmetic number, because the mean of its divisors is an integer number (86763348).

Almost surely, 2^1213131234 is an apocalyptic number.

1213131234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1213131234 is an abundant number, since it is smaller than the sum of its proper divisors (1563295902).

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

1213131234 is a wasteful number, since it uses less digits than its factorization.

1213131234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37050.

The product of its digits is 432, while the sum is 21.

The square root of 1213131234 is about 34830.0335055825. The cubic root of 1213131234 is about 1066.5206323298.

Adding to 1213131234 its reverse (4321313121), we get a palindrome (5534444355).

It can be divided in two parts, 12131 and 31234, that added together give a triangular number (43365 = T₂₉₄).

The spelling of 1213131234 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred thirty-four".