1021111320 has 32 divisors (see below), whose sum is σ = 3063334320. Its totient is φ = 272296320.

The previous prime is 1021111283. The next prime is 1021111327. The reversal of 1021111320 is 231111201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1021111296 and 1021111305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111327) 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, 4254511 + ... + 4254750.

Almost surely, 2^1021111320 is an apocalyptic number.

1021111320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021111320 is an abundant number, since it is smaller than the sum of its proper divisors (2042223000).

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

1021111320 is a wasteful number, since it uses less digits than its factorization.

1021111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8509275 (or 8509271 counting only the distinct ones).

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

The square root of 1021111320 is about 31954.8324983875. The cubic root of 1021111320 is about 1006.9881585526.

Adding to 1021111320 its reverse (231111201), we get a palindrome (1252222521).

The spelling of 1021111320 in words is "one billion, twenty-one million, one hundred eleven thousand, three hundred twenty".