1021311320 has 64 divisors (see below), whose sum is σ = 2403717120. Its totient is φ = 389809024.

The previous prime is 1021311281. The next prime is 1021311323. The reversal of 1021311320 is 231131201.

It is a junction number, because it is equal to n+sod(n) for n = 1021311295 and 1021311304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021311323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461657 + ... + 463863.

It is an arithmetic number, because the mean of its divisors is an integer number (37558080).

Almost surely, 2^1021311320 is an apocalyptic number.

1021311320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021311320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201858560).

1021311320 is an abundant number, since it is smaller than the sum of its proper divisors (1382405800).

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

1021311320 is a wasteful number, since it uses less digits than its factorization.

1021311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744 (or 2740 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1021311320 is about 31957.9617622902. The cubic root of 1021311320 is about 1007.0538988496.

Adding to 1021311320 its reverse (231131201), we get a palindrome (1252442521).

The spelling of 1021311320 in words is "one billion, twenty-one million, three hundred eleven thousand, three hundred twenty".