203113021021 has 4 divisors (see below), whose sum is σ = 205684072000. Its totient is φ = 200541970044.

The previous prime is 203113020997. The next prime is 203113021037. The reversal of 203113021021 is 120120311302.

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-203113021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203113020986 and 203113021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203113021061) 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, 1285525371 + ... + 1285525528.

It is an arithmetic number, because the mean of its divisors is an integer number (51421018000).

Almost surely, 2^203113021021 is an apocalyptic number.

It is an amenable number.

203113021021 is a deficient number, since it is larger than the sum of its proper divisors (2571050979).

203113021021 is an equidigital number, since it uses as much as digits as its factorization.

203113021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571050978.

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

Adding to 203113021021 its reverse (120120311302), we get a palindrome (323233332323).

The spelling of 203113021021 in words is "two hundred three billion, one hundred thirteen million, twenty-one thousand, twenty-one".