31103201311221 has 24 divisors (see below), whose sum is σ = 44946385869216. Its totient is φ = 19123387208640.

The previous prime is 31103201311181. The next prime is 31103201311249. The reversal of 31103201311221 is 12211310230113.

It is not a de Polignac number, because 31103201311221 - 2⁶ = 31103201311157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103201311621) 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, 26744770 + ... + 27883491.

It is an arithmetic number, because the mean of its divisors is an integer number (1872766077884).

Almost surely, 2^{31103201311221} is an apocalyptic number.

It is an amenable number.

31103201311221 is a deficient number, since it is larger than the sum of its proper divisors (13843184557995).

31103201311221 is a wasteful number, since it uses less digits than its factorization.

31103201311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54629413 (or 54629400 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31103201311221 its reverse (12211310230113), we get a palindrome (43314511541334).

The spelling of 31103201311221 in words is "thirty-one trillion, one hundred three billion, two hundred one million, three hundred eleven thousand, two hundred twenty-one".