122217128 has 64 divisors (see below), whose sum is σ = 262103040. Its totient is φ = 52920000.

The previous prime is 122217127. The next prime is 122217149. The reversal of 122217128 is 821712221.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 122217097 and 122217106.

It is not an unprimeable number, because it can be changed into a prime (122217127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193373 + ... + 194003.

It is an arithmetic number, because the mean of its divisors is an integer number (4095360).

Almost surely, 2^122217128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122217128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131051520).

122217128 is an abundant number, since it is smaller than the sum of its proper divisors (139885912).

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

122217128 is a wasteful number, since it uses less digits than its factorization.

122217128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 746 counting only the distinct ones).

The product of its digits is 896, while the sum is 26.

The square root of 122217128 is about 11055.1855705818. The cubic root of 122217128 is about 496.2616227315.

Adding to 122217128 its reverse (821712221), we get a palindrome (943929349).

The spelling of 122217128 in words is "one hundred twenty-two million, two hundred seventeen thousand, one hundred twenty-eight".