2021212100 has 36 divisors (see below), whose sum is σ = 4419540048. Its totient is φ = 802308000.

The previous prime is 2021212091. The next prime is 2021212103. The reversal of 2021212100 is 12121202.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2021212103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64046 + ... + 90245.

Almost surely, 2^2021212100 is an apocalyptic number.

2021212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021212100 is an abundant number, since it is smaller than the sum of its proper divisors (2398327948).

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

2021212100 is a wasteful number, since it uses less digits than its factorization.

2021212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154436 (or 154429 counting only the distinct ones).

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

The square root of 2021212100 is about 44957.8925217809. The cubic root of 2021212100 is about 1264.3596565403.

Adding to 2021212100 its reverse (12121202), we get a palindrome (2033333302).

The spelling of 2021212100 in words is "two billion, twenty-one million, two hundred twelve thousand, one hundred".