210220212221 has 4 divisors (see below), whose sum is σ = 219360221472. Its totient is φ = 201080202972.

The previous prime is 210220212133. The next prime is 210220212227. The reversal of 210220212221 is 122212022012.

It is a happy number.

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 210220212221 - 2¹⁴ = 210220195837 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 210220212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220212227) 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, 4570004591 + ... + 4570004636.

It is an arithmetic number, because the mean of its divisors is an integer number (54840055368).

Almost surely, 2^210220212221 is an apocalyptic number.

It is an amenable number.

210220212221 is a deficient number, since it is larger than the sum of its proper divisors (9140009251).

210220212221 is an equidigital number, since it uses as much as digits as its factorization.

210220212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9140009250.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 210220212221 its reverse (122212022012), we get a palindrome (332432234233).

The spelling of 210220212221 in words is "two hundred ten billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".