1213312032 has 144 divisors (see below), whose sum is σ = 3845892960. Its totient is φ = 360585216.

The previous prime is 1213312019. The next prime is 1213312033. The reversal of 1213312032 is 2302133121.

It is a tau number, because it is divible by the number of its divisors (144).

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 = 1213311996 and 1213312014.

It is not an unprimeable number, because it can be changed into a prime (1213312033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86503 + ... + 99545.

It is an arithmetic number, because the mean of its divisors is an integer number (26707590).

Almost surely, 2^1213312032 is an apocalyptic number.

1213312032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213312032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922946480).

1213312032 is an abundant number, since it is smaller than the sum of its proper divisors (2632580928).

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

1213312032 is a wasteful number, since it uses less digits than its factorization.

1213312032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13095 (or 13084 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1213312032 is about 34832.6288413608. The cubic root of 1213312032 is about 1066.5736123684.

Adding to 1213312032 its reverse (2302133121), we get a palindrome (3515445153).

The spelling of 1213312032 in words is "one billion, two hundred thirteen million, three hundred twelve thousand, thirty-two".