1321013204 has 24 divisors (see below), whose sum is σ = 2655726528. Its totient is φ = 563212800.

The previous prime is 1321013201. The next prime is 1321013207. The reversal of 1321013204 is 4023101231.

It is an interprime number because it is at equal distance from previous prime (1321013201) and next prime (1321013207).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321013201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116822 + ... + 127629.

It is an arithmetic number, because the mean of its divisors is an integer number (110655272).

Almost surely, 2^1321013204 is an apocalyptic number.

1321013204 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1321013204 is an abundant number, since it is smaller than the sum of its proper divisors (1334713324).

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

1321013204 is a wasteful number, since it uses less digits than its factorization.

1321013204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244655 (or 244653 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1321013204 is about 36345.7453355960. The cubic root of 1321013204 is about 1097.2419067832.

Adding to 1321013204 its reverse (4023101231), we get a palindrome (5344114435).

The spelling of 1321013204 in words is "one billion, three hundred twenty-one million, thirteen thousand, two hundred four".