2021212101 has 64 divisors (see below), whose sum is σ = 2999877120. Its totient is φ = 1206374400.

The previous prime is 2021212091. The next prime is 2021212103. The reversal of 2021212101 is 1012121202.

It is not a de Polignac number, because 2021212101 - 2⁹ = 2021211589 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14753305 + ... + 14753441.

It is an arithmetic number, because the mean of its divisors is an integer number (46873080).

Almost surely, 2^2021212101 is an apocalyptic number.

It is an amenable number.

2021212101 is a deficient number, since it is larger than the sum of its proper divisors (978665019).

2021212101 is a wasteful number, since it uses less digits than its factorization.

2021212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2021212101 is about 44957.8925329024. The cubic root of 2021212101 is about 1264.3596567488.

Adding to 2021212101 its reverse (1012121202), we get a palindrome (3033333303).

The spelling of 2021212101 in words is "two billion, twenty-one million, two hundred twelve thousand, one hundred one".