2151304400 has 60 divisors (see below), whose sum is σ = 5906874912. Its totient is φ = 737589120.

The previous prime is 2151304387. The next prime is 2151304409. The reversal of 2151304400 is 44031512.

It is a super-2 number, since 2×2151304400² = 9256221242918720000, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151304409) 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 11 ways as a sum of consecutive naturals, for example, 381362 + ... + 386961.

Almost surely, 2^2151304400 is an apocalyptic number.

2151304400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2151304400 is an abundant number, since it is smaller than the sum of its proper divisors (3755570512).

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

2151304400 is a wasteful number, since it uses less digits than its factorization.

2151304400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768348 (or 768337 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2151304400 is about 46382.1560516542. The cubic root of 2151304400 is about 1290.9238419623.

Adding to 2151304400 its reverse (44031512), we get a palindrome (2195335912).

The spelling of 2151304400 in words is "two billion, one hundred fifty-one million, three hundred four thousand, four hundred".