203110231021 has 4 divisors (see below), whose sum is σ = 213800243200. Its totient is φ = 192420218844.

The previous prime is 203110231013. The next prime is 203110231039. The reversal of 203110231021 is 120132011302.

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 203110231021 - 2³ = 203110231013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203110230986 and 203110231004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203110231921) 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, 5345006061 + ... + 5345006098.

It is an arithmetic number, because the mean of its divisors is an integer number (53450060800).

Almost surely, 2^203110231021 is an apocalyptic number.

It is an amenable number.

203110231021 is a deficient number, since it is larger than the sum of its proper divisors (10690012179).

203110231021 is a wasteful number, since it uses less digits than its factorization.

203110231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10690012178.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 203110231021 its reverse (120132011302), we get a palindrome (323242242323).

The spelling of 203110231021 in words is "two hundred three billion, one hundred ten million, two hundred thirty-one thousand, twenty-one".