31800393421 has 8 divisors (see below), whose sum is σ = 32342277600. Its totient is φ = 31258605840.

The previous prime is 31800393407. The next prime is 31800393437. The reversal of 31800393421 is 12439300813.

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 31800393421 - 2⁵ = 31800393389 is a prime.

It is a super-2 number, since 2×31800393421² (a number of 22 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 (31800393491) 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, 1021831 + ... + 1052491.

It is an arithmetic number, because the mean of its divisors is an integer number (4042784700).

Almost surely, 2^31800393421 is an apocalyptic number.

It is an amenable number.

31800393421 is a deficient number, since it is larger than the sum of its proper divisors (541884179).

31800393421 is a wasteful number, since it uses less digits than its factorization.

31800393421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48299.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 31800393421 in words is "thirty-one billion, eight hundred million, three hundred ninety-three thousand, four hundred twenty-one".