2155451200 has 252 divisors, whose sum is σ = 6498884640. Its totient is φ = 699632640.

The previous prime is 2155451197. The next prime is 2155451209. The reversal of 2155451200 is 21545512.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155451209) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 1488877 + ... + 1490323.

Almost surely, 2^2155451200 is an apocalyptic number.

2155451200 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 2155451200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3249442320).

2155451200 is an abundant number, since it is smaller than the sum of its proper divisors (4343433440).

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

2155451200 is a wasteful number, since it uses less digits than its factorization.

2155451200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 2155451200 is about 46426.8370665071. The cubic root of 2155451200 is about 1291.7527603153.

Adding to 2155451200 its reverse (21545512), we get a palindrome (2176996712).

The spelling of 2155451200 in words is "two billion, one hundred fifty-five million, four hundred fifty-one thousand, two hundred".