31113111100221 has 12 divisors (see below), whose sum is σ = 44962571253600. Its totient is φ = 20732192170440.

The previous prime is 31113111100189. The next prime is 31113111100273. The reversal of 31113111100221 is 12200111131113.

31113111100221 is a `hidden beast` number, since 31 + 1 + 1 + 311 + 1 + 100 + 221 = 666.

It is not a de Polignac number, because 31113111100221 - 2⁵ = 31113111100189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31113111100194 and 31113111100203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113111300221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 823471425 + ... + 823509206.

It is an arithmetic number, because the mean of its divisors is an integer number (3746880937800).

Almost surely, 2^{31113111100221} is an apocalyptic number.

It is an amenable number.

31113111100221 is a deficient number, since it is larger than the sum of its proper divisors (13849460153379).

31113111100221 is a wasteful number, since it uses less digits than its factorization.

31113111100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646982736 (or 1646982733 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 31113111100221 its reverse (12200111131113), we get a palindrome (43313222231334).

The spelling of 31113111100221 in words is "thirty-one trillion, one hundred thirteen billion, one hundred eleven million, one hundred thousand, two hundred twenty-one".