210210222121961 has 2 divisors, whose sum is σ = 210210222121962. Its totient is φ = 210210222121960.

The previous prime is 210210222121909. The next prime is 210210222122023. The reversal of 210210222121961 is 169121222012012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191652348948736 + 18557873173225 = 13843856^2 + 4307885^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210222121961 - 2²⁶ = 210210155013097 is a prime.

It is not a weakly prime, because it can be changed into another prime (210210222124961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105111060980 + 105105111060981.

It is an arithmetic number, because the mean of its divisors is an integer number (105105111060981).

Almost surely, 2^{210210222121961} is an apocalyptic number.

It is an amenable number.

210210222121961 is a deficient number, since it is larger than the sum of its proper divisors (1).

210210222121961 is an equidigital number, since it uses as much as digits as its factorization.

210210222121961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

Adding to 210210222121961 its reverse (169121222012012), we get a palindrome (379331444133973).

The spelling of 210210222121961 in words is "two hundred ten trillion, two hundred ten billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred sixty-one".