203111421 has 4 divisors (see below), whose sum is σ = 270815232. Its totient is φ = 135407612.

The previous prime is 203111407. The next prime is 203111429. The reversal of 203111421 is 124111302.

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 203111421 - 2²³ = 194722813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203111421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203111429) 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, 33851901 + ... + 33851906.

It is an arithmetic number, because the mean of its divisors is an integer number (67703808).

Almost surely, 2^203111421 is an apocalyptic number.

It is an amenable number.

203111421 is a deficient number, since it is larger than the sum of its proper divisors (67703811).

203111421 is an equidigital number, since it uses as much as digits as its factorization.

203111421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67703810.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 203111421 is about 14251.7164229436. The cubic root of 203111421 is about 587.8205726542.

Adding to 203111421 its reverse (124111302), we get a palindrome (327222723).

The spelling of 203111421 in words is "two hundred three million, one hundred eleven thousand, four hundred twenty-one".