15500222120 has 32 divisors (see below), whose sum is σ = 35617536000. Its totient is φ = 6068171328.

The previous prime is 15500222117. The next prime is 15500222131. The reversal of 15500222120 is 2122200551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 15500222092 and 15500222101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4120520 + ... + 4124279.

It is an arithmetic number, because the mean of its divisors is an integer number (1113048000).

Almost surely, 2^15500222120 is an apocalyptic number.

15500222120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15500222120 is an abundant number, since it is smaller than the sum of its proper divisors (20117313880).

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

15500222120 is a wasteful number, since it uses less digits than its factorization.

15500222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8244857 (or 8244853 counting only the distinct ones).

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

Adding to 15500222120 its reverse (2122200551), we get a palindrome (17622422671).

The spelling of 15500222120 in words is "fifteen billion, five hundred million, two hundred twenty-two thousand, one hundred twenty".