20131113431421 has 12 divisors (see below), whose sum is σ = 29129379137820. Its totient is φ = 13397155742400.

The previous prime is 20131113431389. The next prime is 20131113431447. The reversal of 20131113431421 is 12413431113102.

20131113431421 is a `hidden beast` number, since 2 + 0 + 1 + 311 + 1 + 34 + 314 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6959940948900 + 13171172482521 = 2638170^2 + 3629211^2 .

It is not a de Polignac number, because 20131113431421 - 2⁵ = 20131113431389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131113431491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1965540030 + ... + 1965550271.

It is an arithmetic number, because the mean of its divisors is an integer number (2427448261485).

Almost surely, 2^{20131113431421} is an apocalyptic number.

It is an amenable number.

20131113431421 is a deficient number, since it is larger than the sum of its proper divisors (8998265706399).

20131113431421 is a wasteful number, since it uses less digits than its factorization.

20131113431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931090876 (or 3931090873 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 20131113431421 its reverse (12413431113102), we get a palindrome (32544544544523).

The spelling of 20131113431421 in words is "twenty trillion, one hundred thirty-one billion, one hundred thirteen million, four hundred thirty-one thousand, four hundred twenty-one".