203111000021 has 8 divisors (see below), whose sum is σ = 206601652800. Its totient is φ = 199633851648.

The previous prime is 203111000003. The next prime is 203111000063. The reversal of 203111000021 is 120000111302.

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-203111000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203110999966 and 203111000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203111000321) 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, 3345761 + ... + 3405926.

It is an arithmetic number, because the mean of its divisors is an integer number (25825206600).

Almost surely, 2^203111000021 is an apocalyptic number.

It is an amenable number.

203111000021 is a deficient number, since it is larger than the sum of its proper divisors (3490652779).

203111000021 is an equidigital number, since it uses as much as digits as its factorization.

203111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752203.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 203111000021 its reverse (120000111302), we get a palindrome (323111111323).

The spelling of 203111000021 in words is "two hundred three billion, one hundred eleven million, twenty-one", and thus it is an aban number.