210021001121 has 2 divisors, whose sum is σ = 210021001122. Its totient is φ = 210021001120.

The previous prime is 210021001097. The next prime is 210021001189. The reversal of 210021001121 is 121100120012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160096014400 + 49924986721 = 400120^2 + 223439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021001121 is a prime.

It is not a weakly prime, because it can be changed into another prime (210021001621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010500560 + 105010500561.

It is an arithmetic number, because the mean of its divisors is an integer number (105010500561).

Almost surely, 2^210021001121 is an apocalyptic number.

It is an amenable number.

210021001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021001121 is an equidigital number, since it uses as much as digits as its factorization.

210021001121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210021001121 its reverse (121100120012), we get a palindrome (331121121133).

The spelling of 210021001121 in words is "two hundred ten billion, twenty-one million, one thousand, one hundred twenty-one".