212210021001221 has 4 divisors (see below), whose sum is σ = 221436543653472. Its totient is φ = 202983498348972.

The previous prime is 212210021001137. The next prime is 212210021001271. The reversal of 212210021001221 is 122100120012212.

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 212210021001221 - 2³⁸ = 211935143094277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212210021001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210021001271) 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, 4613261326091 + ... + 4613261326136.

It is an arithmetic number, because the mean of its divisors is an integer number (55359135913368).

Almost surely, 2^{212210021001221} is an apocalyptic number.

It is an amenable number.

212210021001221 is a deficient number, since it is larger than the sum of its proper divisors (9226522652251).

212210021001221 is an equidigital number, since it uses as much as digits as its factorization.

212210021001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9226522652250.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212210021001221 its reverse (122100120012212), we get a palindrome (334310141013433).

The spelling of 212210021001221 in words is "two hundred twelve trillion, two hundred ten billion, twenty-one million, one thousand, two hundred twenty-one".