202423121 has 4 divisors (see below), whose sum is σ = 203331072. Its totient is φ = 201515172.

The previous prime is 202423099. The next prime is 202423153. The reversal of 202423121 is 121324202.

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 a de Polignac number, because none of the positive numbers 2^k-202423121 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 202423121.

It is not an unprimeable number, because it can be changed into a prime (202423171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453641 + ... + 454086.

It is an arithmetic number, because the mean of its divisors is an integer number (50832768).

Almost surely, 2^202423121 is an apocalyptic number.

It is an amenable number.

202423121 is a deficient number, since it is larger than the sum of its proper divisors (907951).

202423121 is an equidigital number, since it uses as much as digits as its factorization.

202423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907950.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 202423121 is about 14227.5479616131. The cubic root of 202423121 is about 587.1558229148.

Adding to 202423121 its reverse (121324202), we get a palindrome (323747323).

The spelling of 202423121 in words is "two hundred two million, four hundred twenty-three thousand, one hundred twenty-one".