22012161 has 8 divisors (see below), whose sum is σ = 31076064. Its totient is φ = 13811520.

The previous prime is 22012157. The next prime is 22012171. The reversal of 22012161 is 16121022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22012161 - 2² = 22012157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22012161.

It is not an unprimeable number, because it can be changed into a prime (22012141) 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 in 7 ways as a sum of consecutive naturals, for example, 215755 + ... + 215856.

It is an arithmetic number, because the mean of its divisors is an integer number (3884508).

Almost surely, 2^22012161 is an apocalyptic number.

It is an amenable number.

22012161 is a deficient number, since it is larger than the sum of its proper divisors (9063903).

22012161 is a wasteful number, since it uses less digits than its factorization.

22012161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431631.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 22012161 is about 4691.7119476797. The cubic root of 22012161 is about 280.2555532527.

Adding to 22012161 its reverse (16121022), we get a palindrome (38133183).

The spelling of 22012161 in words is "twenty-two million, twelve thousand, one hundred sixty-one".