22161265 has 16 divisors (see below), whose sum is σ = 30487680. Its totient is φ = 15148800.

The previous prime is 22161241. The next prime is 22161281. The reversal of 22161265 is 56216122.

It is not a de Polignac number, because 22161265 - 2¹¹ = 22159217 is a prime.

It is a super-2 number, since 2×22161265² = 982243332800450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13246 + ... + 14824.

It is an arithmetic number, because the mean of its divisors is an integer number (1905480).

Almost surely, 2^22161265 is an apocalyptic number.

It is an amenable number.

22161265 is a deficient number, since it is larger than the sum of its proper divisors (8326415).

22161265 is a wasteful number, since it uses less digits than its factorization.

22161265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its digits is 1440, while the sum is 25.

The square root of 22161265 is about 4707.5752782085. The cubic root of 22161265 is about 280.8869197954.

Adding to 22161265 its reverse (56216122), we get a palindrome (78377387).

It can be divided in two parts, 2216 and 1265, that added together give a square (3481 = 59²).

The spelling of 22161265 in words is "twenty-two million, one hundred sixty-one thousand, two hundred sixty-five".