2111103131221 has 4 divisors (see below), whose sum is σ = 2412689292832. Its totient is φ = 1809516969612.

The previous prime is 2111103131219. The next prime is 2111103131273. The reversal of 2111103131221 is 1221313011112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111103131221 - 2¹ = 2111103131219 is a prime.

It is a super-2 number, since 2×2111103131221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111103131281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150793080795 + ... + 150793080808.

It is an arithmetic number, because the mean of its divisors is an integer number (603172323208).

Almost surely, 2^{2111103131221} is an apocalyptic number.

It is an amenable number.

2111103131221 is a deficient number, since it is larger than the sum of its proper divisors (301586161611).

2111103131221 is an equidigital number, since it uses as much as digits as its factorization.

2111103131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301586161610.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 2111103131221 its reverse (1221313011112), we get a palindrome (3332416142333).

The spelling of 2111103131221 in words is "two trillion, one hundred eleven billion, one hundred three million, one hundred thirty-one thousand, two hundred twenty-one".