21022022111 has 4 divisors (see below), whose sum is σ = 21024750432. Its totient is φ = 21019293792.

The previous prime is 21022022107. The next prime is 21022022239. The reversal of 21022022111 is 11122022012.

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 21022022111 - 2² = 21022022107 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 (21022022101) 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, 1352570 + ... + 1368023.

It is an arithmetic number, because the mean of its divisors is an integer number (5256187608).

Almost surely, 2^21022022111 is an apocalyptic number.

21022022111 is a deficient number, since it is larger than the sum of its proper divisors (2728321).

21022022111 is an equidigital number, since it uses as much as digits as its factorization.

21022022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728320.

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

Adding to 21022022111 its reverse (11122022012), we get a palindrome (32144044123).

Subtracting from 21022022111 its reverse (11122022012), we obtain a palindrome (9900000099).

The spelling of 21022022111 in words is "twenty-one billion, twenty-two million, twenty-two thousand, one hundred eleven".