212202222221021 has 4 divisors (see below), whose sum is σ = 221428405795872. Its totient is φ = 202976038646172.

The previous prime is 212202222220997. The next prime is 212202222221161. The reversal of 212202222221021 is 120122222202212.

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 212202222221021 - 2¹⁸ = 212202221958877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 9226183574827 = 212202222221021 / (2 + 1 + 2 + 2 + 0 + 2 + 2 + 2 + 2 + 2 + 2 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202222223021) 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, 4613091787391 + ... + 4613091787436.

It is an arithmetic number, because the mean of its divisors is an integer number (55357101448968).

Almost surely, 2^{212202222221021} is an apocalyptic number.

It is an amenable number.

212202222221021 is a deficient number, since it is larger than the sum of its proper divisors (9226183574851).

212202222221021 is an equidigital number, since it uses as much as digits as its factorization.

212202222221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9226183574850.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 212202222221021 its reverse (120122222202212), we get a palindrome (332324444423233).

The spelling of 212202222221021 in words is "two hundred twelve trillion, two hundred two billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty-one".