31321220002100 has 72 divisors (see below), whose sum is σ = 77678931230208. Its totient is φ = 10738385251200.

The previous prime is 31321220002021. The next prime is 31321220002103. The reversal of 31321220002100 is 120002212313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321220002103) 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, 23566934 + ... + 24860466.

It is an arithmetic number, because the mean of its divisors is an integer number (1078874044864).

Almost surely, 2^{31321220002100} is an apocalyptic number.

It is an amenable number.

31321220002100 is an abundant number, since it is smaller than the sum of its proper divisors (46357711228108).

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

31321220002100 is a wasteful number, since it uses less digits than its factorization.

31321220002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328145 (or 1328138 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31321220002100 its reverse (120002212313), we get a palindrome (31441222214413).

The spelling of 31321220002100 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twenty million, two thousand, one hundred".