1331220120 has 32 divisors (see below), whose sum is σ = 3993660720. Its totient is φ = 354992000.

The previous prime is 1331220083. The next prime is 1331220157. The reversal of 1331220120 is 210221331.

1331220120 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1331220083) and next prime (1331220157).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1331220120.

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, 5546631 + ... + 5546870.

Almost surely, 2^1331220120 is an apocalyptic number.

1331220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331220120 is an abundant number, since it is smaller than the sum of its proper divisors (2662440600).

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

1331220120 is a wasteful number, since it uses less digits than its factorization.

1331220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093515 (or 11093511 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331220120 is about 36485.8893272454. The cubic root of 1331220120 is about 1100.0606357759.

Adding to 1331220120 its reverse (210221331), we get a palindrome (1541441451).

The spelling of 1331220120 in words is "one billion, three hundred thirty-one million, two hundred twenty thousand, one hundred twenty".