203220112121 has 4 divisors (see below), whose sum is σ = 218852428452. Its totient is φ = 187587795792.

The previous prime is 203220112099. The next prime is 203220112247. The reversal of 203220112121 is 121211022302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131162762896 + 72057349225 = 362164^2 + 268435^2 .

It is a cyclic number.

It is not a de Polignac number, because 203220112121 - 2²⁶ = 203153003257 is a prime.

It is a super-2 number, since 2×203220112121² (a number of 23 digits) contains 22 as substring.

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 203220112121.

It is not an unprimeable number, because it can be changed into a prime (203220112021) 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, 7816158146 + ... + 7816158171.

It is an arithmetic number, because the mean of its divisors is an integer number (54713107113).

Almost surely, 2^203220112121 is an apocalyptic number.

It is an amenable number.

203220112121 is a deficient number, since it is larger than the sum of its proper divisors (15632316331).

203220112121 is a wasteful number, since it uses less digits than its factorization.

203220112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15632316330.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 203220112121 its reverse (121211022302), we get a palindrome (324431134423).

The spelling of 203220112121 in words is "two hundred three billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".