22161442444 has 24 divisors (see below), whose sum is σ = 39635805888. Its totient is φ = 10837261440.

The previous prime is 22161442427. The next prime is 22161442447. The reversal of 22161442444 is 44424416122.

It is a happy number.

It is a super-2 number, since 2×22161442444² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161442447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228274 + ... + 310534.

It is an arithmetic number, because the mean of its divisors is an integer number (1651491912).

Almost surely, 2^22161442444 is an apocalyptic number.

It is an amenable number.

22161442444 is a deficient number, since it is larger than the sum of its proper divisors (17474363444).

22161442444 is a wasteful number, since it uses less digits than its factorization.

22161442444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83745 (or 83743 counting only the distinct ones).

The product of its digits is 49152, while the sum is 34.

Adding to 22161442444 its reverse (44424416122), we get a palindrome (66585858566).

The spelling of 22161442444 in words is "twenty-two billion, one hundred sixty-one million, four hundred forty-two thousand, four hundred forty-four".