221310123321011 has 4 divisors (see below), whose sum is σ = 226456870375032. Its totient is φ = 216163376266992.

The previous prime is 221310123320989. The next prime is 221310123321017. The reversal of 221310123321011 is 110123321013122.

It is a happy number.

221310123321011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 221310123321011 - 2⁴² = 216912076809907 is a prime.

It is a super-2 number, since 2×221310123321011² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221310123321017) 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, 2573373526946 + ... + 2573373527031.

It is an arithmetic number, because the mean of its divisors is an integer number (56614217593758).

Almost surely, 2^{221310123321011} is an apocalyptic number.

221310123321011 is a deficient number, since it is larger than the sum of its proper divisors (5146747054021).

221310123321011 is an equidigital number, since it uses as much as digits as its factorization.

221310123321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146747054020.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 221310123321011 its reverse (110123321013122), we get a palindrome (331433444334133).

The spelling of 221310123321011 in words is "two hundred twenty-one trillion, three hundred ten billion, one hundred twenty-three million, three hundred twenty-one thousand, eleven".