21222201111 has 16 divisors (see below), whose sum is σ = 29470353408. Its totient is φ = 13571863200.

The previous prime is 21222201047. The next prime is 21222201149. The reversal of 21222201111 is 11110222212.

It is not a de Polignac number, because 21222201111 - 2⁶ = 21222201047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222201181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1338535 + ... + 1354296.

It is an arithmetic number, because the mean of its divisors is an integer number (1841897088).

Almost surely, 2^21222201111 is an apocalyptic number.

21222201111 is a deficient number, since it is larger than the sum of its proper divisors (8248152297).

21222201111 is a wasteful number, since it uses less digits than its factorization.

21222201111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692942.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21222201111 its reverse (11110222212), we get a palindrome (32332423323).

The spelling of 21222201111 in words is "twenty-one billion, two hundred twenty-two million, two hundred one thousand, one hundred eleven".