210220123311221 has 4 divisors (see below), whose sum is σ = 210422452593600. Its totient is φ = 210017794028844.

The previous prime is 210220123311203. The next prime is 210220123311229. The reversal of 210220123311221 is 122113321022012.

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 210220123311221 - 2²⁶ = 210220056202357 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 (210220123311229) 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, 101164639631 + ... + 101164641708.

It is an arithmetic number, because the mean of its divisors is an integer number (52605613148400).

Almost surely, 2^{210220123311221} is an apocalyptic number.

It is an amenable number.

210220123311221 is a deficient number, since it is larger than the sum of its proper divisors (202329282379).

210220123311221 is a wasteful number, since it uses less digits than its factorization.

210220123311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202329282378.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 210220123311221 its reverse (122113321022012), we get a palindrome (332333444333233).

The spelling of 210220123311221 in words is "two hundred ten trillion, two hundred twenty billion, one hundred twenty-three million, three hundred eleven thousand, two hundred twenty-one".