21302444200 has 24 divisors (see below), whose sum is σ = 49528183230. Its totient is φ = 8520977600.

The previous prime is 21302444179. The next prime is 21302444227. The reversal of 21302444200 is 244420312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 9809317764 + 11493126436 = 99042^2 + 107206^2 .

It is a super-2 number, since 2×21302444200² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53255911 + ... + 53256310.

Almost surely, 2^21302444200 is an apocalyptic number.

21302444200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302444200 is an abundant number, since it is smaller than the sum of its proper divisors (28225739030).

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

21302444200 is a wasteful number, since it uses less digits than its factorization.

21302444200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106512237 (or 106512228 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21302444200 its reverse (244420312), we get a palindrome (21546864512).

The spelling of 21302444200 in words is "twenty-one billion, three hundred two million, four hundred forty-four thousand, two hundred".