202003121 has 4 divisors (see below), whose sum is σ = 206700912. Its totient is φ = 197305332.

The previous prime is 202003103. The next prime is 202003141. The reversal of 202003121 is 121300202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202003121 - 2¹⁸ = 201740977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202003141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2348831 + ... + 2348916.

It is an arithmetic number, because the mean of its divisors is an integer number (51675228).

Almost surely, 2^202003121 is an apocalyptic number.

It is an amenable number.

202003121 is a deficient number, since it is larger than the sum of its proper divisors (4697791).

202003121 is an equidigital number, since it uses as much as digits as its factorization.

202003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697790.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 202003121 is about 14212.7801995247. The cubic root of 202003121 is about 586.7494526696.

Adding to 202003121 its reverse (121300202), we get a palindrome (323303323).

The spelling of 202003121 in words is "two hundred two million, three thousand, one hundred twenty-one".