22129399 has 4 divisors (see below), whose sum is σ = 22166464. Its totient is φ = 22092336.

The previous prime is 22129361. The next prime is 22129409. The reversal of 22129399 is 99392122.

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 22129399 - 2¹¹ = 22127351 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 (22129309) 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, 17622 + ... + 18835.

It is an arithmetic number, because the mean of its divisors is an integer number (5541616).

Almost surely, 2^22129399 is an apocalyptic number.

22129399 is a deficient number, since it is larger than the sum of its proper divisors (37065).

22129399 is an equidigital number, since it uses as much as digits as its factorization.

22129399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37064.

The product of its digits is 17496, while the sum is 37.

The square root of 22129399 is about 4704.1895157402. The cubic root of 22129399 is about 280.7522247746.

It can be divided in two parts, 2212 and 9399, that added together give a palindrome (11611).

The spelling of 22129399 in words is "twenty-two million, one hundred twenty-nine thousand, three hundred ninety-nine".