1021231320 has 64 divisors (see below), whose sum is σ = 3072906720. Its totient is φ = 271509504.

The previous prime is 1021231319. The next prime is 1021231373. The reversal of 1021231320 is 231321201.

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 1021231320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27814 + ... + 53066.

Almost surely, 2^1021231320 is an apocalyptic number.

1021231320 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 1021231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1536453360).

1021231320 is an abundant number, since it is smaller than the sum of its proper divisors (2051675400).

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

1021231320 is a wasteful number, since it uses less digits than its factorization.

1021231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25604 (or 25600 counting only the distinct ones).

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

The square root of 1021231320 is about 31956.7100934999. The cubic root of 1021231320 is about 1007.0276037608.

Adding to 1021231320 its reverse (231321201), we get a palindrome (1252552521).

The spelling of 1021231320 in words is "one billion, twenty-one million, two hundred thirty-one thousand, three hundred twenty".