1321010120 has 16 divisors (see below), whose sum is σ = 2972272860. Its totient is φ = 528404032.

The previous prime is 1321010111. The next prime is 1321010137. The reversal of 1321010120 is 210101231.

It can be written as a sum of positive squares in 2 ways, for example, as 1261812484 + 59197636 = 35522^2 + 7694^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16512587 + ... + 16512666.

Almost surely, 2^1321010120 is an apocalyptic number.

1321010120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321010120 is an abundant number, since it is smaller than the sum of its proper divisors (1651262740).

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

1321010120 is a wasteful number, since it uses less digits than its factorization.

1321010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33025264 (or 33025260 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1321010120 is about 36345.7029096976. The cubic root of 1321010120 is about 1097.2410529192.

Adding to 1321010120 its reverse (210101231), we get a palindrome (1531111351).

The spelling of 1321010120 in words is "one billion, three hundred twenty-one million, ten thousand, one hundred twenty".