31221331104 has 24 divisors (see below), whose sum is σ = 81955994400. Its totient is φ = 10407110336.

The previous prime is 31221331073. The next prime is 31221331109. The reversal of 31221331104 is 40113312213.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (31221331109) 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, 162611004 + ... + 162611195.

It is an arithmetic number, because the mean of its divisors is an integer number (3414833100).

Almost surely, 2^31221331104 is an apocalyptic number.

It is an amenable number.

31221331104 is an abundant number, since it is smaller than the sum of its proper divisors (50734663296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221331104 is a wasteful number, since it uses less digits than its factorization.

31221331104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325222212 (or 325222204 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31221331104 its reverse (40113312213), we get a palindrome (71334643317).

The spelling of 31221331104 in words is "thirty-one billion, two hundred twenty-one million, three hundred thirty-one thousand, one hundred four".