22161072 has 20 divisors (see below), whose sum is σ = 57249560. Its totient is φ = 7387008.

The previous prime is 22161043. The next prime is 22161077. The reversal of 22161072 is 27016122.

It is a super-2 number, since 2×22161072² = 982226224378368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230797 + ... + 230892.

It is an arithmetic number, because the mean of its divisors is an integer number (2862478).

Almost surely, 2^22161072 is an apocalyptic number.

It is an amenable number.

22161072 is an abundant number, since it is smaller than the sum of its proper divisors (35088488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22161072 is a wasteful number, since it uses less digits than its factorization.

22161072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461700 (or 461694 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 22161072 is about 4707.5547792883. The cubic root of 22161072 is about 280.8861043887.

Adding to 22161072 its reverse (27016122), we get a palindrome (49177194).

The spelling of 22161072 in words is "twenty-two million, one hundred sixty-one thousand, seventy-two".