21223203221111 has 4 divisors (see below), whose sum is σ = 21223228100424. Its totient is φ = 21223178341800.

The previous prime is 21223203221021. The next prime is 21223203221123. The reversal of 21223203221111 is 11112230232212.

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 21223203221111 - 2¹⁸ = 21223202958967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223203223111) 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, 11112920 + ... + 12881901.

It is an arithmetic number, because the mean of its divisors is an integer number (5305807025106).

Almost surely, 2^{21223203221111} is an apocalyptic number.

21223203221111 is a deficient number, since it is larger than the sum of its proper divisors (24879313).

21223203221111 is an equidigital number, since it uses as much as digits as its factorization.

21223203221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24879312.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21223203221111 its reverse (11112230232212), we get a palindrome (32335433453323).

The spelling of 21223203221111 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred three million, two hundred twenty-one thousand, one hundred eleven".