2155122200 has 96 divisors (see below), whose sum is σ = 6247100160. Its totient is φ = 671721600.

The previous prime is 2155122197. The next prime is 2155122217. The reversal of 2155122200 is 22215512.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54572 + ... + 85371.

It is an arithmetic number, because the mean of its divisors is an integer number (65073960).

Almost surely, 2^2155122200 is an apocalyptic number.

2155122200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155122200 is an abundant number, since it is smaller than the sum of its proper divisors (4091977960).

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

2155122200 is a wasteful number, since it uses less digits than its factorization.

2155122200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139977 (or 139968 counting only the distinct ones).

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

The square root of 2155122200 is about 46423.2937220099. The cubic root of 2155122200 is about 1291.6870342031.

Adding to 2155122200 its reverse (22215512), we get a palindrome (2177337712).

It can be divided in two parts, 215512 and 2200, that added together give a palindrome (217712).

The spelling of 2155122200 in words is "two billion, one hundred fifty-five million, one hundred twenty-two thousand, two hundred".