31201102111221 has 24 divisors (see below), whose sum is σ = 52898651030784. Its totient is φ = 17347330902240.

The previous prime is 31201102111219. The next prime is 31201102111241. The reversal of 31201102111221 is 12211120110213.

It is a happy number.

31201102111221 is a `hidden beast` number, since 3 + 120 + 110 + 211 + 1 + 221 = 666.

It is not a de Polignac number, because 31201102111221 - 2¹ = 31201102111219 is a prime.

It is a super-2 number, since 2×31201102111221² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31201102111194 and 31201102111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201102111211) 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, 6692640765 + ... + 6692645426.

It is an arithmetic number, because the mean of its divisors is an integer number (2204110459616).

Almost surely, 2^{31201102111221} is an apocalyptic number.

It is an amenable number.

31201102111221 is a deficient number, since it is larger than the sum of its proper divisors (21697548919563).

31201102111221 is a wasteful number, since it uses less digits than its factorization.

31201102111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13385286241 (or 13385286238 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 31201102111221 its reverse (12211120110213), we get a palindrome (43412222221434).

The spelling of 31201102111221 in words is "thirty-one trillion, two hundred one billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".