31220331404 has 12 divisors (see below), whose sum is σ = 54642457800. Its totient is φ = 15608200608.

The previous prime is 31220331323. The next prime is 31220331407. The reversal of 31220331404 is 40413302213.

It is a super-2 number, since 2×31220331404² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31220331404.

It is not an unprimeable number, because it can be changed into a prime (31220331407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455234 + ... + 519305.

It is an arithmetic number, because the mean of its divisors is an integer number (4553538150).

Almost surely, 2^31220331404 is an apocalyptic number.

It is an amenable number.

31220331404 is a deficient number, since it is larger than the sum of its proper divisors (23422126396).

31220331404 is a wasteful number, since it uses less digits than its factorization.

31220331404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982552 (or 982550 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31220331404 its reverse (40413302213), we get a palindrome (71633633617).

The spelling of 31220331404 in words is "thirty-one billion, two hundred twenty million, three hundred thirty-one thousand, four hundred four".