22121243 has 4 divisors (see below), whose sum is σ = 22387848. Its totient is φ = 21854640.

The previous prime is 22121213. The next prime is 22121293. The reversal of 22121243 is 34212122.

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 22121243 - 2¹⁶ = 22055707 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (22121213) 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, 133178 + ... + 133343.

It is an arithmetic number, because the mean of its divisors is an integer number (5596962).

Almost surely, 2^22121243 is an apocalyptic number.

22121243 is a deficient number, since it is larger than the sum of its proper divisors (266605).

22121243 is an equidigital number, since it uses as much as digits as its factorization.

22121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266604.

The product of its digits is 192, while the sum is 17.

The square root of 22121243 is about 4703.3225490072. The cubic root of 22121243 is about 280.7177292375.

Subtracting from 22121243 its sum of digits (17), we obtain a triangular number (22121226 = T₆₆₅₁).

Adding to 22121243 its reverse (34212122), we get a palindrome (56333365).

The spelling of 22121243 in words is "twenty-two million, one hundred twenty-one thousand, two hundred forty-three".