22161447 has 48 divisors (see below), whose sum is σ = 40405248. Its totient is φ = 11370240.

The previous prime is 22161437. The next prime is 22161449. The reversal of 22161447 is 74416122.

22161447 is a `hidden beast` number, since 2 + 2 + 1 + 614 + 47 = 666.

It is not a de Polignac number, because 22161447 - 2⁴ = 22161431 is a prime.

It is a super-2 number, since 2×22161447² = 982259466267618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22161447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78168 + ... + 78450.

It is an arithmetic number, because the mean of its divisors is an integer number (841776).

Almost surely, 2^22161447 is an apocalyptic number.

22161447 is a deficient number, since it is larger than the sum of its proper divisors (18243801).

22161447 is a wasteful number, since it uses less digits than its factorization.

22161447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 417 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22161447 is about 4707.5946087147. The cubic root of 22161447 is about 280.8876887238.

Adding to 22161447 its reverse (74416122), we get a palindrome (96577569).

It can be divided in two parts, 2216 and 1447, that added together give a palindrome (3663).

The spelling of 22161447 in words is "twenty-two million, one hundred sixty-one thousand, four hundred forty-seven".