202002121 has 8 divisors (see below), whose sum is σ = 208982088. Its totient is φ = 195120000.

The previous prime is 202002113. The next prime is 202002149. The reversal of 202002121 is 121200202.

It can be written as a sum of positive squares in 4 ways, for example, as 2175625 + 199826496 = 1475^2 + 14136^2 .

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 202002121 - 2³ = 202002113 is a prime.

It is a Duffinian number.

202002121 is a modest number, since divided by 2121 gives 202 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 202002098 and 202002107.

It is not an unprimeable number, because it can be changed into a prime (202002191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20250 + ... + 28531.

It is an arithmetic number, because the mean of its divisors is an integer number (26122761).

Almost surely, 2^202002121 is an apocalyptic number.

It is an amenable number.

202002121 is a deficient number, since it is larger than the sum of its proper divisors (6979967).

202002121 is a wasteful number, since it uses less digits than its factorization.

202002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48923.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 202002121 is about 14212.7450198756. The cubic root of 202002121 is about 586.7484844496.

Adding to 202002121 its reverse (121200202), we get a palindrome (323202323).

The spelling of 202002121 in words is "two hundred two million, two thousand, one hundred twenty-one".