210222220121 has 4 divisors (see below), whose sum is σ = 219362316672. Its totient is φ = 201082123572.

The previous prime is 210222220111. The next prime is 210222220141. The reversal of 210222220121 is 121022222012.

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 210222220121 - 2⁶ = 210222220057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 210222220121.

It is not an unprimeable number, because it can be changed into a prime (210222220111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4570048241 + ... + 4570048286.

It is an arithmetic number, because the mean of its divisors is an integer number (54840579168).

Almost surely, 2^210222220121 is an apocalyptic number.

It is an amenable number.

210222220121 is a deficient number, since it is larger than the sum of its proper divisors (9140096551).

210222220121 is an equidigital number, since it uses as much as digits as its factorization.

210222220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9140096550.

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

Adding to 210222220121 its reverse (121022222012), we get a palindrome (331244442133).

The spelling of 210222220121 in words is "two hundred ten billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".