122215500 has 192 divisors, whose sum is σ = 431907840. Its totient is φ = 29592000.

The previous prime is 122215493. The next prime is 122215501. The reversal of 122215500 is 5512221.

122215500 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

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

122215500 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (122215501) 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 63 ways as a sum of consecutive naturals, for example, 148089 + ... + 148911.

It is an arithmetic number, because the mean of its divisors is an integer number (2249520).

Almost surely, 2^122215500 is an apocalyptic number.

122215500 is a gapful number since it is divisible by the number (10) 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 122215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215953920).

122215500 is an abundant number, since it is smaller than the sum of its proper divisors (309692340).

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

122215500 is a wasteful number, since it uses less digits than its factorization.

122215500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 844 counting only the distinct ones).

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

The square root of 122215500 is about 11055.1119397318. Note that the first 3 decimals coincide. The cubic root of 122215500 is about 496.2594192283.

Adding to 122215500 its reverse (5512221), we get a palindrome (127727721).

The spelling of 122215500 in words is "one hundred twenty-two million, two hundred fifteen thousand, five hundred".