22155012 has 96 divisors (see below), whose sum is σ = 66407040. Its totient is φ = 6312960.

The previous prime is 22155011. The next prime is 22155059. The reversal of 22155012 is 21055122.

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 (22155011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19648 + ... + 20744.

It is an arithmetic number, because the mean of its divisors is an integer number (691740).

Almost surely, 2^22155012 is an apocalyptic number.

22155012 is a gapful number since it is divisible by the number (22) 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 22155012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33203520).

22155012 is an abundant number, since it is smaller than the sum of its proper divisors (44252028).

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

22155012 is a wasteful number, since it uses less digits than its factorization.

22155012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1130 counting only the distinct ones).

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

The square root of 22155012 is about 4706.9110890264. The cubic root of 22155012 is about 280.8604990544.

It can be divided in two parts, 2215 and 5012, that added together give a palindrome (7227).

The spelling of 22155012 in words is "twenty-two million, one hundred fifty-five thousand, twelve".