21334451200 has 66 divisors (see below), whose sum is σ = 52883667746. Its totient is φ = 8533770240.

The previous prime is 21334451179. The next prime is 21334451209. The reversal of 21334451200 is 215443312.

It can be written as a sum of positive squares in 3 ways, for example, as 13778944 + 21320672256 = 3712^2 + 146016^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21334451209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 391089 + ... + 442288.

Almost surely, 2^21334451200 is an apocalyptic number.

21334451200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21334451200 is an abundant number, since it is smaller than the sum of its proper divisors (31549216546).

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

21334451200 is an equidigital number, since it uses as much as digits as its factorization.

21334451200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833407 (or 833384 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21334451200 its reverse (215443312), we get a palindrome (21549894512).

The spelling of 21334451200 in words is "twenty-one billion, three hundred thirty-four million, four hundred fifty-one thousand, two hundred".