22011156 has 24 divisors (see below), whose sum is σ = 57066240. Its totient is φ = 7337016.

The previous prime is 22011151. The next prime is 22011163. The reversal of 22011156 is 65111022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011151) 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, 101796 + ... + 102011.

It is an arithmetic number, because the mean of its divisors is an integer number (2377760).

Almost surely, 2^22011156 is an apocalyptic number.

It is an amenable number.

22011156 is an abundant number, since it is smaller than the sum of its proper divisors (35055084).

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

22011156 is a wasteful number, since it uses less digits than its factorization.

22011156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203820 (or 203812 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 22011156 is about 4691.6048426951. The cubic root of 22011156 is about 280.2512880177.

Adding to 22011156 its reverse (65111022), we get a palindrome (87122178).

The spelling of 22011156 in words is "twenty-two million, eleven thousand, one hundred fifty-six".