31320233400021 has 8 divisors (see below), whose sum is σ = 41760538074720. Its totient is φ = 20880042162672.

The previous prime is 31320233400011. The next prime is 31320233400031. The reversal of 31320233400021 is 12000433202313.

It is an interprime number because it is at equal distance from previous prime (31320233400011) and next prime (31320233400031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31320233400021 - 2²⁵ = 31320199845589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31320233399964 and 31320233400000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320233400011) 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, 27712995 + ... + 28821008.

It is an arithmetic number, because the mean of its divisors is an integer number (5220067259340).

Almost surely, 2^{31320233400021} is an apocalyptic number.

It is an amenable number.

31320233400021 is a deficient number, since it is larger than the sum of its proper divisors (10440304674699).

31320233400021 is a wasteful number, since it uses less digits than its factorization.

31320233400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56718675.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31320233400021 its reverse (12000433202313), we get a palindrome (43320666602334).

The spelling of 31320233400021 in words is "thirty-one trillion, three hundred twenty billion, two hundred thirty-three million, four hundred thousand, twenty-one".