31103100201221 has 4 divisors (see below), whose sum is σ = 31103239819500. Its totient is φ = 31102960582944.

The previous prime is 31103100201181. The next prime is 31103100201253. The reversal of 31103100201221 is 12210200130113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13302177256225 + 17800922944996 = 3647215^2 + 4219114^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103100201221 - 2¹⁰ = 31103100200197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31103100201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103102201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69474446 + ... + 69920703.

It is an arithmetic number, because the mean of its divisors is an integer number (7775809954875).

Almost surely, 2^{31103100201221} is an apocalyptic number.

It is an amenable number.

31103100201221 is a deficient number, since it is larger than the sum of its proper divisors (139618279).

31103100201221 is a wasteful number, since it uses less digits than its factorization.

31103100201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139618278.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31103100201221 its reverse (12210200130113), we get a palindrome (43313300331334).

The spelling of 31103100201221 in words is "thirty-one trillion, one hundred three billion, one hundred million, two hundred one thousand, two hundred twenty-one".