22215000 has 80 divisors (see below), whose sum is σ = 69446520. Its totient is φ = 5920000.

The previous prime is 22214993. The next prime is 22215001. The reversal of 22215000 is 51222.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22215001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14260 + ... + 15740.

Almost surely, 2^22215000 is an apocalyptic number.

22215000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22215000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34723260).

22215000 is an abundant number, since it is smaller than the sum of its proper divisors (47231520).

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

22215000 is a wasteful number, since it uses less digits than its factorization.

22215000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 22215000 is about 4713.2791133138. The cubic root of 22215000 is about 281.1137611764.

Adding to 22215000 its reverse (51222), we get a palindrome (22266222).

The spelling of 22215000 in words is "twenty-two million, two hundred fifteen thousand".