210202121 has 8 divisors (see below), whose sum is σ = 222755400. Its totient is φ = 198002560.

The previous prime is 210202067. The next prime is 210202123. The reversal of 210202121 is 121202012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1081600 + 209120521 = 1040^2 + 14461^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210202121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210202123) 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, 87206 + ... + 89583.

It is an arithmetic number, because the mean of its divisors is an integer number (27844425).

Almost surely, 2^210202121 is an apocalyptic number.

It is an amenable number.

210202121 is a deficient number, since it is larger than the sum of its proper divisors (12553279).

210202121 is a wasteful number, since it uses less digits than its factorization.

210202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176859.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 210202121 is about 14498.3489059962. The cubic root of 210202121 is about 594.5828311836.

Adding to 210202121 its reverse (121202012), we get a palindrome (331404133).

The spelling of 210202121 in words is "two hundred ten million, two hundred two thousand, one hundred twenty-one".