203421311 has 8 divisors (see below), whose sum is σ = 209132544. Its totient is φ = 197767800.

The previous prime is 203421307. The next prime is 203421331. The reversal of 203421311 is 113124302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 203421311 - 2² = 203421307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203421311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203421331) 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, 7235 + ... + 21428.

It is an arithmetic number, because the mean of its divisors is an integer number (26141568).

Almost surely, 2^203421311 is an apocalyptic number.

203421311 is a deficient number, since it is larger than the sum of its proper divisors (5711233).

203421311 is a wasteful number, since it uses less digits than its factorization.

203421311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28861.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 203421311 is about 14262.5843029936. The cubic root of 203421311 is about 588.1193694978.

Adding to 203421311 its reverse (113124302), we get a palindrome (316545613).

The spelling of 203421311 in words is "two hundred three million, four hundred twenty-one thousand, three hundred eleven".