31100121221012 has 6 divisors (see below), whose sum is σ = 54425212136778. Its totient is φ = 15550060610504.

The previous prime is 31100121221011. The next prime is 31100121221101. The reversal of 31100121221012 is 21012212100113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 29464009061776 + 1636112159236 = 5428076^2 + 1279106^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31100121221011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3887515152623 + ... + 3887515152630.

It is an arithmetic number, because the mean of its divisors is an integer number (9070868689463).

Almost surely, 2^{31100121221012} is an apocalyptic number.

It is an amenable number.

31100121221012 is a deficient number, since it is larger than the sum of its proper divisors (23325090915766).

31100121221012 is a wasteful number, since it uses less digits than its factorization.

31100121221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775030305257 (or 7775030305255 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 31100121221012 its reverse (21012212100113), we get a palindrome (52112333321125).

The spelling of 31100121221012 in words is "thirty-one trillion, one hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, twelve".