210948402121 has 4 divisors (see below), whose sum is σ = 210951063700. Its totient is φ = 210945740544.

The previous prime is 210948402109. The next prime is 210948402149. The reversal of 210948402121 is 121204849012.

It is a happy number.

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 80052780096 + 130895622025 = 282936^2 + 361795^2 .

It is a cyclic number.

It is not a de Polignac number, because 210948402121 - 2³⁵ = 176588663753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210948402151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1208136 + ... + 1371673.

It is an arithmetic number, because the mean of its divisors is an integer number (52737765925).

Almost surely, 2^210948402121 is an apocalyptic number.

It is an amenable number.

210948402121 is a deficient number, since it is larger than the sum of its proper divisors (2661579).

210948402121 is an equidigital number, since it uses as much as digits as its factorization.

210948402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661578.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 210948402121 in words is "two hundred ten billion, nine hundred forty-eight million, four hundred two thousand, one hundred twenty-one".