203404411421 has 8 divisors (see below), whose sum is σ = 204945404664. Its totient is φ = 201864234240.

The previous prime is 203404411411. The next prime is 203404411451. The reversal of 203404411421 is 124114404302.

It can be written as a sum of positive squares in 4 ways, for example, as 18086215225 + 185318196196 = 134485^2 + 430486^2 .

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 203404411421 - 2²² = 203400217117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203404411411) 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, 301091 + ... + 705311.

It is an arithmetic number, because the mean of its divisors is an integer number (25618175583).

Almost surely, 2^203404411421 is an apocalyptic number.

It is an amenable number.

203404411421 is a deficient number, since it is larger than the sum of its proper divisors (1540993243).

203404411421 is a wasteful number, since it uses less digits than its factorization.

203404411421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408031.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 203404411421 its reverse (124114404302), we get a palindrome (327518815723).

The spelling of 203404411421 in words is "two hundred three billion, four hundred four million, four hundred eleven thousand, four hundred twenty-one".