203311130021 has 32 divisors (see below), whose sum is σ = 211706732160. Its totient is φ = 195142881024.

The previous prime is 203311129937. The next prime is 203311130041. The reversal of 203311130021 is 120031113302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203311130021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203311130041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 245248235 + ... + 245249063.

It is an arithmetic number, because the mean of its divisors is an integer number (6615835380).

Almost surely, 2^203311130021 is an apocalyptic number.

It is an amenable number.

203311130021 is a deficient number, since it is larger than the sum of its proper divisors (8395602139).

203311130021 is a wasteful number, since it uses less digits than its factorization.

203311130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 203311130021 its reverse (120031113302), we get a palindrome (323342243323).

The spelling of 203311130021 in words is "two hundred three billion, three hundred eleven million, one hundred thirty thousand, twenty-one".