212210402221 has 4 divisors (see below), whose sum is σ = 221436941472. Its totient is φ = 202983862972.

The previous prime is 212210402189. The next prime is 212210402237. The reversal of 212210402221 is 122204012212.

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 212210402221 - 2⁵ = 212210402189 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 (212210402021) 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, 4613269591 + ... + 4613269636.

It is an arithmetic number, because the mean of its divisors is an integer number (55359235368).

Almost surely, 2^212210402221 is an apocalyptic number.

It is an amenable number.

212210402221 is a deficient number, since it is larger than the sum of its proper divisors (9226539251).

212210402221 is an equidigital number, since it uses as much as digits as its factorization.

212210402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9226539250.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212210402221 its reverse (122204012212), we get a palindrome (334414414433).

The spelling of 212210402221 in words is "two hundred twelve billion, two hundred ten million, four hundred two thousand, two hundred twenty-one".