202123121 has 8 divisors (see below), whose sum is σ = 215938080. Its totient is φ = 188625888.

The previous prime is 202123111. The next prime is 202123139. The reversal of 202123121 is 121321202.

It is a happy number.

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-202123121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202123096 and 202123105.

It is not an unprimeable number, because it can be changed into a prime (202123111) 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, 78116 + ... + 80661.

It is an arithmetic number, because the mean of its divisors is an integer number (26992260).

Almost surely, 2^202123121 is an apocalyptic number.

It is an amenable number.

202123121 is a deficient number, since it is larger than the sum of its proper divisors (13814959).

202123121 is a wasteful number, since it uses less digits than its factorization.

202123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158863.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 202123121 is about 14217.0011254132. The cubic root of 202123121 is about 586.8656158857.

Adding to 202123121 its reverse (121321202), we get a palindrome (323444323).

The spelling of 202123121 in words is "two hundred two million, one hundred twenty-three thousand, one hundred twenty-one".