211210020121 has 2 divisors, whose sum is σ = 211210020122. Its totient is φ = 211210020120.

The previous prime is 211210020101. The next prime is 211210020143. The reversal of 211210020121 is 121020012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110133714496 + 101076305625 = 331864^2 + 317925^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210020121 - 2¹⁷ = 211209889049 is a prime.

It is not a weakly prime, because it can be changed into another prime (211210020101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605010060 + 105605010061.

It is an arithmetic number, because the mean of its divisors is an integer number (105605010061).

Almost surely, 2^211210020121 is an apocalyptic number.

It is an amenable number.

211210020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210020121 is an equidigital number, since it uses as much as digits as its factorization.

211210020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211210020121 its reverse (121020012112), we get a palindrome (332230032233).

The spelling of 211210020121 in words is "two hundred eleven billion, two hundred ten million, twenty thousand, one hundred twenty-one".