22213891 has 4 divisors (see below), whose sum is σ = 25387312. Its totient is φ = 19040472.

The previous prime is 22213889. The next prime is 22213903. The reversal of 22213891 is 19831222.

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 22213891 - 2¹ = 22213889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22213811) 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, 1586700 + ... + 1586713.

It is an arithmetic number, because the mean of its divisors is an integer number (6346828).

Almost surely, 2^22213891 is an apocalyptic number.

22213891 is a deficient number, since it is larger than the sum of its proper divisors (3173421).

22213891 is an equidigital number, since it uses as much as digits as its factorization.

22213891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173420.

The product of its digits is 1728, while the sum is 28.

The square root of 22213891 is about 4713.1614655134. The cubic root of 22213891 is about 281.1090832509.

It can be divided in two parts, 22213 and 891, that added together give a square (23104 = 152²).

The spelling of 22213891 in words is "twenty-two million, two hundred thirteen thousand, eight hundred ninety-one".