22128811 has 2 divisors, whose sum is σ = 22128812. Its totient is φ = 22128810.

The previous prime is 22128809. The next prime is 22128839. The reversal of 22128811 is 11882122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22128811 - 2¹ = 22128809 is a prime.

Together with 22128809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22128851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11064405 + 11064406.

It is an arithmetic number, because the mean of its divisors is an integer number (11064406).

Almost surely, 2^22128811 is an apocalyptic number.

22128811 is a deficient number, since it is larger than the sum of its proper divisors (1).

22128811 is an equidigital number, since it uses as much as digits as its factorization.

22128811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 25.

The square root of 22128811 is about 4704.1270178429. The cubic root of 22128811 is about 280.7497381312.

The spelling of 22128811 in words is "twenty-two million, one hundred twenty-eight thousand, eight hundred eleven".