210122021200121 has 2 divisors, whose sum is σ = 210122021200122. Its totient is φ = 210122021200120.

The previous prime is 210122021200109. The next prime is 210122021200139. The reversal of 210122021200121 is 121002120221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194489130916096 + 15632890284025 = 13945936^2 + 3953845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210122021200121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210122021200121.

It is not a weakly prime, because it can be changed into another prime (210122021200321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061010600060 + 105061010600061.

It is an arithmetic number, because the mean of its divisors is an integer number (105061010600061).

Almost surely, 2^{210122021200121} is an apocalyptic number.

It is an amenable number.

210122021200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210122021200121 is an equidigital number, since it uses as much as digits as its factorization.

210122021200121 is an evil number, because the sum of its binary digits is even.

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

Adding to 210122021200121 its reverse (121002120221012), we get a palindrome (331124141421133).

The spelling of 210122021200121 in words is "two hundred ten trillion, one hundred twenty-two billion, twenty-one million, two hundred thousand, one hundred twenty-one".