2021122100 has 18 divisors (see below), whose sum is σ = 4385835174. Its totient is φ = 808448800.

The previous prime is 2021122063. The next prime is 2021122109. The reversal of 2021122100 is 12211202.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 602997136 + 1418124964 = 24556^2 + 37658^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021122109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10105511 + ... + 10105710.

Almost surely, 2^2021122100 is an apocalyptic number.

2021122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021122100 is an abundant number, since it is smaller than the sum of its proper divisors (2364713074).

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

2021122100 is a wasteful number, since it uses less digits than its factorization.

2021122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20211235 (or 20211228 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2021122100 is about 44956.8915740401. The cubic root of 2021122100 is about 1264.3408899039.

Adding to 2021122100 its reverse (12211202), we get a palindrome (2033333302).

The spelling of 2021122100 in words is "two billion, twenty-one million, one hundred twenty-two thousand, one hundred".