22021243 has 4 divisors (see below), whose sum is σ = 22182120. Its totient is φ = 21860368.

The previous prime is 22021229. The next prime is 22021249. The reversal of 22021243 is 34212022.

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 22021243 - 2⁵ = 22021211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021249) 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, 80233 + ... + 80506.

It is an arithmetic number, because the mean of its divisors is an integer number (5545530).

Almost surely, 2^22021243 is an apocalyptic number.

22021243 is a deficient number, since it is larger than the sum of its proper divisors (160877).

22021243 is a wasteful number, since it uses less digits than its factorization.

22021243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160876.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 22021243 is about 4692.6797248481. The cubic root of 22021243 is about 280.2940915099.

Adding to 22021243 its reverse (34212022), we get a palindrome (56233265).

The spelling of 22021243 in words is "twenty-two million, twenty-one thousand, two hundred forty-three".