1321204120 has 32 divisors (see below), whose sum is σ = 2973834000. Its totient is φ = 528281728.

The previous prime is 1321204061. The next prime is 1321204163. The reversal of 1321204120 is 214021231.

It is a junction number, because it is equal to n+sod(n) for n = 1321204094 and 1321204103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147531 + ... + 156229.

Almost surely, 2^1321204120 is an apocalyptic number.

1321204120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321204120 is an abundant number, since it is smaller than the sum of its proper divisors (1652629880).

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

1321204120 is a wasteful number, since it uses less digits than its factorization.

1321204120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12507 (or 12503 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1321204120 is about 36348.3716279010. The cubic root of 1321204120 is about 1097.2947629153.

Adding to 1321204120 its reverse (214021231), we get a palindrome (1535225351).

The spelling of 1321204120 in words is "one billion, three hundred twenty-one million, two hundred four thousand, one hundred twenty".