22161081 has 16 divisors (see below), whose sum is σ = 31382208. Its totient is φ = 13862400.

The previous prime is 22161077. The next prime is 22161101. The reversal of 22161081 is 18016122.

It is not a de Polignac number, because 22161081 - 2² = 22161077 is a prime.

It is a super-2 number, since 2×22161081² = 982227022177122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22161031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28741 + ... + 29501.

It is an arithmetic number, because the mean of its divisors is an integer number (1961388).

Almost surely, 2^22161081 is an apocalyptic number.

It is an amenable number.

22161081 is a deficient number, since it is larger than the sum of its proper divisors (9221127).

22161081 is a wasteful number, since it uses less digits than its factorization.

22161081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 22161081 is about 4707.5557351985. Note that the first 3 decimals coincide. The cubic root of 22161081 is about 280.8861424129.

The spelling of 22161081 in words is "twenty-two million, one hundred sixty-one thousand, eighty-one".