212211210002221 has 4 divisors (see below), whose sum is σ = 212643412059744. Its totient is φ = 211779007944700.

The previous prime is 212211210002201. The next prime is 212211210002243. The reversal of 212211210002221 is 122200012112212.

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 212211210002221 - 2²⁷ = 212211075784493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212211210002201) 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, 216101028025 + ... + 216101029006.

It is an arithmetic number, because the mean of its divisors is an integer number (53160853014936).

Almost surely, 2^{212211210002221} is an apocalyptic number.

It is an amenable number.

212211210002221 is a deficient number, since it is larger than the sum of its proper divisors (432202057523).

212211210002221 is an equidigital number, since it uses as much as digits as its factorization.

212211210002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432202057522.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212211210002221 its reverse (122200012112212), we get a palindrome (334411222114433).

The spelling of 212211210002221 in words is "two hundred twelve trillion, two hundred eleven billion, two hundred ten million, two thousand, two hundred twenty-one".