221111311023 has 12 divisors (see below), whose sum is σ = 328014978408. Its totient is φ = 143423552880.

The previous prime is 221111311009. The next prime is 221111311027. The reversal of 221111311023 is 320113111122.

221111311023 is a `hidden beast` number, since 221 + 111 + 311 + 0 + 23 = 666.

It is not a de Polignac number, because 221111311023 - 2⁵ = 221111310991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221111310987 and 221111311005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111311027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331998633 + ... + 331999298.

It is an arithmetic number, because the mean of its divisors is an integer number (27334581534).

Almost surely, 2^221111311023 is an apocalyptic number.

221111311023 is a deficient number, since it is larger than the sum of its proper divisors (106903667385).

221111311023 is a wasteful number, since it uses less digits than its factorization.

221111311023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663997974 (or 663997971 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 221111311023 its reverse (320113111122), we get a palindrome (541224422145).

The spelling of 221111311023 in words is "two hundred twenty-one billion, one hundred eleven million, three hundred eleven thousand, twenty-three".