2821212400 has 30 divisors (see below), whose sum is σ = 6777963752. Its totient is φ = 1128484800.

The previous prime is 2821212391. The next prime is 2821212403. The reversal of 2821212400 is 42121282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821212403) 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 5 ways as a sum of consecutive naturals, for example, 3526116 + ... + 3526915.

Almost surely, 2^2821212400 is an apocalyptic number.

2821212400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2821212400 is an abundant number, since it is smaller than the sum of its proper divisors (3956751352).

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

2821212400 is a wasteful number, since it uses less digits than its factorization.

2821212400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7053049 (or 7053038 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 2821212400 is about 53115.0863691287. The cubic root of 2821212400 is about 1413.0100843946.

Adding to 2821212400 its reverse (42121282), we get a palindrome (2863333682).

The spelling of 2821212400 in words is "two billion, eight hundred twenty-one million, two hundred twelve thousand, four hundred".