22121265 has 8 divisors (see below), whose sum is σ = 35394048. Its totient is φ = 11798000.

The previous prime is 22121213. The next prime is 22121293. The reversal of 22121265 is 56212122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22121265 - 2⁶ = 22121201 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737361 + ... + 737390.

It is an arithmetic number, because the mean of its divisors is an integer number (4424256).

Almost surely, 2^22121265 is an apocalyptic number.

It is an amenable number.

22121265 is a deficient number, since it is larger than the sum of its proper divisors (13272783).

22121265 is a wasteful number, since it uses less digits than its factorization.

22121265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474759.

The product of its digits is 480, while the sum is 21.

The square root of 22121265 is about 4703.3248877789. The cubic root of 22121265 is about 280.7178222972.

Adding to 22121265 its reverse (56212122), we get a palindrome (78333387).

The spelling of 22121265 in words is "twenty-two million, one hundred twenty-one thousand, two hundred sixty-five".