31321401100 has 72 divisors (see below), whose sum is σ = 74590725888. Its totient is φ = 11321332800.

The previous prime is 31321401079. The next prime is 31321401109. The reversal of 31321401100 is 110412313.

It is not an unprimeable number, because it can be changed into a prime (31321401109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98449 + ... + 268951.

It is an arithmetic number, because the mean of its divisors is an integer number (1035982304).

Almost surely, 2^31321401100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31321401100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37295362944).

31321401100 is an abundant number, since it is smaller than the sum of its proper divisors (43269324788).

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

31321401100 is a wasteful number, since it uses less digits than its factorization.

31321401100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170695 (or 170688 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31321401100 its reverse (110412313), we get a palindrome (31431813413).

The spelling of 31321401100 in words is "thirty-one billion, three hundred twenty-one million, four hundred one thousand, one hundred".