2115222120 has 256 divisors, whose sum is σ = 8097408000. Its totient is φ = 485740800.

The previous prime is 2115222079. The next prime is 2115222133. The reversal of 2115222120 is 212225112.

2115222120 is a `hidden beast` number, since 21 + 1 + 522 + 2 + 120 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 2115222093 and 2115222102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 221035 + ... + 230405.

It is an arithmetic number, because the mean of its divisors is an integer number (31630500).

Almost surely, 2^2115222120 is an apocalyptic number.

2115222120 is a gapful number since it is divisible by the number (20) 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 2115222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4048704000).

2115222120 is an abundant number, since it is smaller than the sum of its proper divisors (5982185880).

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

2115222120 is a wasteful number, since it uses less digits than its factorization.

2115222120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421 (or 9411 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2115222120 is about 45991.5440053930. The cubic root of 2115222120 is about 1283.6658664148.

Adding to 2115222120 its reverse (212225112), we get a palindrome (2327447232).

The spelling of 2115222120 in words is "two billion, one hundred fifteen million, two hundred twenty-two thousand, one hundred twenty".