1021312120 has 32 divisors (see below), whose sum is σ = 2341314720. Its totient is φ = 400816000.

The previous prime is 1021312087. The next prime is 1021312129. The reversal of 1021312120 is 212131201.

It is a self number, because there is not a number n which added to its sum of digits gives 1021312120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021312129) 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, 238756 + ... + 242995.

It is an arithmetic number, because the mean of its divisors is an integer number (73166085).

Almost surely, 2^1021312120 is an apocalyptic number.

1021312120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021312120 is an abundant number, since it is smaller than the sum of its proper divisors (1320002600).

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

1021312120 is a wasteful number, since it uses less digits than its factorization.

1021312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481815 (or 481811 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021312120 is about 31957.9742787305. The cubic root of 1021312120 is about 1007.0541617935.

Adding to 1021312120 its reverse (212131201), we get a palindrome (1233443321).

The spelling of 1021312120 in words is "one billion, twenty-one million, three hundred twelve thousand, one hundred twenty".