203131110013421 has 32 divisors (see below), whose sum is σ = 208834352039040. Its totient is φ = 197515525939200.

The previous prime is 203131110013409. The next prime is 203131110013453. The reversal of 203131110013421 is 124310011131302.

It is a cyclic number.

It is not a de Polignac number, because 203131110013421 - 2¹⁴ = 203131109997037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203131110013721) 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, 16968593966 + ... + 16968605936.

It is an arithmetic number, because the mean of its divisors is an integer number (6526073501220).

Almost surely, 2^{203131110013421} is an apocalyptic number.

It is an amenable number.

203131110013421 is a deficient number, since it is larger than the sum of its proper divisors (5703242025619).

203131110013421 is a wasteful number, since it uses less digits than its factorization.

203131110013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20637.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 203131110013421 its reverse (124310011131302), we get a palindrome (327441121144723).

The spelling of 203131110013421 in words is "two hundred three trillion, one hundred thirty-one billion, one hundred ten million, thirteen thousand, four hundred twenty-one".