2112122200021 has 4 divisors (see below), whose sum is σ = 2112183817612. Its totient is φ = 2112060582432.

The previous prime is 2112122200007. The next prime is 2112122200037. The reversal of 2112122200021 is 1200022212112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1649647396996 + 462474803025 = 1284386^2 + 680055^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112122200021 - 2⁵ = 2112122199989 is a prime.

It is a super-2 number, since 2×2112122200021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112122199968 and 2112122200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112122200081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30757350 + ... + 30825943.

It is an arithmetic number, because the mean of its divisors is an integer number (528045954403).

Almost surely, 2^{2112122200021} is an apocalyptic number.

It is an amenable number.

2112122200021 is a deficient number, since it is larger than the sum of its proper divisors (61617591).

2112122200021 is an equidigital number, since it uses as much as digits as its factorization.

2112122200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61617590.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2112122200021 its reverse (1200022212112), we get a palindrome (3312144412133).

The spelling of 2112122200021 in words is "two trillion, one hundred twelve billion, one hundred twenty-two million, two hundred thousand, twenty-one".