1021000100 has 36 divisors (see below), whose sum is σ = 2291975700. Its totient is φ = 394316160.

The previous prime is 1021000073. The next prime is 1021000103. The reversal of 1021000100 is 10001201.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 24840256 + 996159844 = 4984^2 + 31562^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is not an unprimeable number, because it can be changed into a prime (1021000103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173135 + ... + 178934.

Almost surely, 2^1021000100 is an apocalyptic number.

1021000100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021000100 is an abundant number, since it is smaller than the sum of its proper divisors (1270975600).

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

1021000100 is a wasteful number, since it uses less digits than its factorization.

1021000100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352112 (or 352105 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 1021000100 is about 31953.0921821347. The cubic root of 1021000100 is about 1006.9515966593.

Adding to 1021000100 its reverse (10001201), we get a palindrome (1031001301).

The spelling of 1021000100 in words is "one billion, twenty-one million, one hundred", and thus it is an aban number.