210202002121 has 8 divisors (see below), whose sum is σ = 213704087688. Its totient is φ = 206701728000.

The previous prime is 210202002107. The next prime is 210202002137. The reversal of 210202002121 is 121200202012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7103961225 + 203098040896 = 84285^2 + 450664^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210202002121 - 2²⁹ = 209665131209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210202002181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217840 + ... + 684001.

It is an arithmetic number, because the mean of its divisors is an integer number (26713010961).

Almost surely, 2^210202002121 is an apocalyptic number.

It is an amenable number.

210202002121 is a deficient number, since it is larger than the sum of its proper divisors (3502085567).

210202002121 is an equidigital number, since it uses as much as digits as its factorization.

210202002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905723.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210202002121 its reverse (121200202012), we get a palindrome (331402204133).

The spelling of 210202002121 in words is "two hundred ten billion, two hundred two million, two thousand, one hundred twenty-one".