2212100021221 has 4 divisors (see below), whose sum is σ = 2212103764512. Its totient is φ = 2212096277932.

The previous prime is 2212100021191. The next prime is 2212100021297. The reversal of 2212100021221 is 1221200012122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2212100021221 - 2²³ = 2212091632613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2212100021195 and 2212100021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212100021921) 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, 768481 + ... + 2239366.

It is an arithmetic number, because the mean of its divisors is an integer number (553025941128).

Almost surely, 2^{2212100021221} is an apocalyptic number.

It is an amenable number.

2212100021221 is a deficient number, since it is larger than the sum of its proper divisors (3743291).

2212100021221 is an equidigital number, since it uses as much as digits as its factorization.

2212100021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743290.

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

Adding to 2212100021221 its reverse (1221200012122), we get a palindrome (3433300033343).

Subtracting from 2212100021221 its reverse (1221200012122), we obtain a palindrome (990900009099).

The spelling of 2212100021221 in words is "two trillion, two hundred twelve billion, one hundred million, twenty-one thousand, two hundred twenty-one".