21202222111 has 4 divisors (see below), whose sum is σ = 24231110992. Its totient is φ = 18173333232.

The previous prime is 21202222109. The next prime is 21202222133. The reversal of 21202222111 is 11122220212.

It is a happy number.

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 21202222111 - 2¹ = 21202222109 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 (21202222141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514444430 + ... + 1514444443.

It is an arithmetic number, because the mean of its divisors is an integer number (6057777748).

Almost surely, 2^21202222111 is an apocalyptic number.

21202222111 is a deficient number, since it is larger than the sum of its proper divisors (3028888881).

21202222111 is an equidigital number, since it uses as much as digits as its factorization.

21202222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028888880.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202222111 its reverse (11122220212), we get a palindrome (32324442323).

The spelling of 21202222111 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, one hundred eleven".