122515220 has 12 divisors (see below), whose sum is σ = 257282004. Its totient is φ = 49006080.

The previous prime is 122515219. The next prime is 122515223. The reversal of 122515220 is 22515221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 74684164 + 47831056 = 8642^2 + 6916^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6125761 = 122515220 / (1 + 2 + 2 + 5 + 1 + 5 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 122515192 and 122515201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122515223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3062861 + ... + 3062900.

It is an arithmetic number, because the mean of its divisors is an integer number (21440167).

Almost surely, 2^122515220 is an apocalyptic number.

122515220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122515220 is an abundant number, since it is smaller than the sum of its proper divisors (134766784).

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

122515220 is a wasteful number, since it uses less digits than its factorization.

122515220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6125770 (or 6125768 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 122515220 is about 11068.6593587480. The cubic root of 122515220 is about 496.6647618403.

Subtracting from 122515220 its reverse (22515221), we obtain a palindrome (99999999).

It can be divided in two parts, 12251 and 5220, that added together give a palindrome (17471).

The spelling of 122515220 in words is "one hundred twenty-two million, five hundred fifteen thousand, two hundred twenty".