102210220120121 has 4 divisors (see below), whose sum is σ = 103147928561700. Its totient is φ = 101272511678544.

The previous prime is 102210220120111. The next prime is 102210220120153. The reversal of 102210220120121 is 121021022012201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65303853966400 + 36906366153721 = 8081080^2 + 6075061^2 .

It is a cyclic number.

It is not a de Polignac number, because 102210220120121 - 2¹⁴ = 102210220103737 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 102210220120121.

It is not an unprimeable number, because it can be changed into a prime (102210220120111) 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, 468854220626 + ... + 468854220843.

It is an arithmetic number, because the mean of its divisors is an integer number (25786982140425).

Almost surely, 2^{102210220120121} is an apocalyptic number.

It is an amenable number.

102210220120121 is a deficient number, since it is larger than the sum of its proper divisors (937708441579).

102210220120121 is an equidigital number, since it uses as much as digits as its factorization.

102210220120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937708441578.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102210220120121 its reverse (121021022012201), we get a palindrome (223231242132322).

The spelling of 102210220120121 in words is "one hundred two trillion, two hundred ten billion, two hundred twenty million, one hundred twenty thousand, one hundred twenty-one".