22251405 has 16 divisors (see below), whose sum is σ = 38839104. Its totient is φ = 10788480.

The previous prime is 22251391. The next prime is 22251421. The reversal of 22251405 is 50415222.

It is a happy number.

It is not a de Polignac number, because 22251405 - 2⁷ = 22251277 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67264 + ... + 67593.

It is an arithmetic number, because the mean of its divisors is an integer number (2427444).

Almost surely, 2^22251405 is an apocalyptic number.

It is an amenable number.

22251405 is a deficient number, since it is larger than the sum of its proper divisors (16587699).

22251405 is a wasteful number, since it uses less digits than its factorization.

22251405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134876.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22251405 is about 4717.1394933794. The cubic root of 22251405 is about 281.2672364745.

Adding to 22251405 its reverse (50415222), we get a palindrome (72666627).

The spelling of 22251405 in words is "twenty-two million, two hundred fifty-one thousand, four hundred five".