21222020111 has 4 divisors (see below), whose sum is σ = 21432139224. Its totient is φ = 21011901000.

The previous prime is 21222020089. The next prime is 21222020117. The reversal of 21222020111 is 11102022212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222020111 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 (21222020117) 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, 105059405 + ... + 105059606.

It is an arithmetic number, because the mean of its divisors is an integer number (5358034806).

Almost surely, 2^21222020111 is an apocalyptic number.

21222020111 is a deficient number, since it is larger than the sum of its proper divisors (210119113).

21222020111 is a wasteful number, since it uses less digits than its factorization.

21222020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210119112.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21222020111 its reverse (11102022212), we get a palindrome (32324042323).

The spelling of 21222020111 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, one hundred eleven".