2021100400 has 60 divisors (see below), whose sum is σ = 5297131944. Its totient is φ = 734944000.

The previous prime is 2021100391. The next prime is 2021100409. The reversal of 2021100400 is 40011202.

It is an interprime number because it is at equal distance from previous prime (2021100391) and next prime (2021100409).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021100409) 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, 225271 + ... + 234070.

Almost surely, 2^2021100400 is an apocalyptic number.

2021100400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021100400 is an abundant number, since it is smaller than the sum of its proper divisors (3276031544).

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

2021100400 is a wasteful number, since it uses less digits than its factorization.

2021100400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459370 (or 459359 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2021100400 is about 44956.6502310837. The cubic root of 2021100400 is about 1264.3363649759.

Adding to 2021100400 its reverse (40011202), we get a palindrome (2061111602).

The spelling of 2021100400 in words is "two billion, twenty-one million, one hundred thousand, four hundred".