22161836 has 6 divisors (see below), whose sum is σ = 38783220. Its totient is φ = 11080916.

The previous prime is 22161833. The next prime is 22161859. The reversal of 22161836 is 63816122.

It is a super-2 number, since 2×22161836² = 982293949781792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22161799 and 22161808.

It is not an unprimeable number, because it can be changed into a prime (22161833) by changing a digit.

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 as a sum of consecutive naturals, namely, 2770226 + ... + 2770233.

It is an arithmetic number, because the mean of its divisors is an integer number (6463870).

Almost surely, 2^22161836 is an apocalyptic number.

It is an amenable number.

22161836 is a deficient number, since it is larger than the sum of its proper divisors (16621384).

22161836 is a wasteful number, since it uses less digits than its factorization.

22161836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540463 (or 5540461 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 22161836 is about 4707.6359247503. The cubic root of 22161836 is about 280.8893321886.

Adding to 22161836 its reverse (63816122), we get a palindrome (85977958).

The spelling of 22161836 in words is "twenty-two million, one hundred sixty-one thousand, eight hundred thirty-six".