21222213111 has 60 divisors (see below), whose sum is σ = 35288730400. Its totient is φ = 12698674560.

The previous prime is 21222213059. The next prime is 21222213119. The reversal of 21222213111 is 11131222212.

It is not a de Polignac number, because 21222213111 - 2⁷ = 21222212983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222213119) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 760575 + ... + 787983.

Almost surely, 2^21222213111 is an apocalyptic number.

21222213111 is a deficient number, since it is larger than the sum of its proper divisors (14066517289).

21222213111 is a wasteful number, since it uses less digits than its factorization.

21222213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27522 (or 27502 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 21222213111 its reverse (11131222212), we get a palindrome (32353435323).

The spelling of 21222213111 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirteen thousand, one hundred eleven".