202009121 has 8 divisors (see below), whose sum is σ = 214318080. Its totient is φ = 189867888.

The previous prime is 202009111. The next prime is 202009123. The reversal of 202009121 is 121900202.

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 202009121 - 2¹⁰ = 202008097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202009121.

It is not an unprimeable number, because it can be changed into a prime (202009123) 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, 39446 + ... + 44271.

It is an arithmetic number, because the mean of its divisors is an integer number (26789760).

Almost surely, 2^202009121 is an apocalyptic number.

It is an amenable number.

202009121 is a deficient number, since it is larger than the sum of its proper divisors (12308959).

202009121 is a wasteful number, since it uses less digits than its factorization.

202009121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83863.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 202009121 is about 14212.9912755901. The cubic root of 202009121 is about 586.7552619229.

Adding to 202009121 its reverse (121900202), we get a palindrome (323909323).

The spelling of 202009121 in words is "two hundred two million, nine thousand, one hundred twenty-one".