1021313100 has 36 divisors (see below), whose sum is σ = 2955000104. Its totient is φ = 272350080.

The previous prime is 1021313087. The next prime is 1021313119. The reversal of 1021313100 is 13131201.

It is a super-2 number, since 2×1021313100² = 2086160896463220000, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1701889 + ... + 1702488.

Almost surely, 2^1021313100 is an apocalyptic number.

1021313100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021313100 is an abundant number, since it is smaller than the sum of its proper divisors (1933687004).

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

1021313100 is a wasteful number, since it uses less digits than its factorization.

1021313100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404394 (or 3404387 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1021313100 is about 31957.9896113632. The cubic root of 1021313100 is about 1007.0544838997.

Adding to 1021313100 its reverse (13131201), we get a palindrome (1034444301).

The spelling of 1021313100 in words is "one billion, twenty-one million, three hundred thirteen thousand, one hundred".