21431112013 has 8 divisors (see below), whose sum is σ = 21524019200. Its totient is φ = 21338326368.

The previous prime is 21431112007. The next prime is 21431112023. The reversal of 21431112013 is 31021113412.

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 21431112013 - 2²¹ = 21429014861 is a prime.

It is a super-2 number, since 2×21431112013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431112023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332353 + ... + 391561.

It is an arithmetic number, because the mean of its divisors is an integer number (2690502400).

Almost surely, 2^21431112013 is an apocalyptic number.

It is an amenable number.

21431112013 is a deficient number, since it is larger than the sum of its proper divisors (92907187).

21431112013 is a wasteful number, since it uses less digits than its factorization.

21431112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60771.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21431112013 its reverse (31021113412), we get a palindrome (52452225425).

The spelling of 21431112013 in words is "twenty-one billion, four hundred thirty-one million, one hundred twelve thousand, thirteen".