31320400421 has 16 divisors (see below), whose sum is σ = 32052888000. Its totient is φ = 30596636928.

The previous prime is 31320400409. The next prime is 31320400429. The reversal of 31320400421 is 12400402313.

It is a cyclic number.

It is not a de Polignac number, because 31320400421 - 2¹⁸ = 31320138277 is a prime.

It is a super-3 number, since 3×31320400421³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31320400393 and 31320400402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320400429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4853405 + ... + 4859853.

It is an arithmetic number, because the mean of its divisors is an integer number (2003305500).

Almost surely, 2^31320400421 is an apocalyptic number.

It is an amenable number.

31320400421 is a deficient number, since it is larger than the sum of its proper divisors (732487579).

31320400421 is a wasteful number, since it uses less digits than its factorization.

31320400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7108.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31320400421 its reverse (12400402313), we get a palindrome (43720802734).

The spelling of 31320400421 in words is "thirty-one billion, three hundred twenty million, four hundred thousand, four hundred twenty-one".