21431233793 has 8 divisors (see below), whose sum is σ = 21656072256. Its totient is φ = 21206718000.

The previous prime is 21431233781. The next prime is 21431233799. The reversal of 21431233793 is 39733213412.

It is a happy number.

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 21431233793 - 2¹⁰ = 21431232769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431233799) 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, 54038 + ... + 213968.

It is an arithmetic number, because the mean of its divisors is an integer number (2707009032).

Almost surely, 2^21431233793 is an apocalyptic number.

It is an amenable number.

21431233793 is a deficient number, since it is larger than the sum of its proper divisors (224838463).

21431233793 is a wasteful number, since it uses less digits than its factorization.

21431233793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161335.

The product of its digits is 81648, while the sum is 38.

The spelling of 21431233793 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, seven hundred ninety-three".