15222120 has 32 divisors (see below), whose sum is σ = 45666720. Its totient is φ = 4059200.

The previous prime is 15222101. The next prime is 15222131. The reversal of 15222120 is 2122251.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 15222120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63306 + ... + 63545.

It is an arithmetic number, because the mean of its divisors is an integer number (1427085).

Almost surely, 2^15222120 is an apocalyptic number.

15222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15222120 is an abundant number, since it is smaller than the sum of its proper divisors (30444600).

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

15222120 is a wasteful number, since it uses less digits than its factorization.

15222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126865 (or 126861 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 15222120 is about 3901.5535367338. The cubic root of 15222120 is about 247.8325699590.

Adding to 15222120 its reverse (2122251), we get a palindrome (17344371).

The spelling of 15222120 in words is "fifteen million, two hundred twenty-two thousand, one hundred twenty".