22021155 has 24 divisors (see below), whose sum is σ = 41107248. Its totient is φ = 10840896.

The previous prime is 22021151. The next prime is 22021159. The reversal of 22021155 is 55112022.

It is an interprime number because it is at equal distance from previous prime (22021151) and next prime (22021159).

It is not a de Polignac number, because 22021155 - 2² = 22021151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18237 + ... + 19406.

It is an arithmetic number, because the mean of its divisors is an integer number (1712802).

Almost surely, 2^22021155 is an apocalyptic number.

22021155 is a deficient number, since it is larger than the sum of its proper divisors (19086093).

22021155 is a wasteful number, since it uses less digits than its factorization.

22021155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37667 (or 37664 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 22021155 is about 4692.6703485329. The cubic root of 22021155 is about 280.2937181444.

Adding to 22021155 its reverse (55112022), we get a palindrome (77133177).

The spelling of 22021155 in words is "twenty-two million, twenty-one thousand, one hundred fifty-five".