21421330000 has 150 divisors (see below), whose sum is σ = 60332020386. Its totient is φ = 7344288000.

The previous prime is 21421329997. The next prime is 21421330003. The reversal of 21421330000 is 3312412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21421329997) and next prime (21421330003).

It can be written as a sum of positive squares in 5 ways, for example, as 2024640016 + 19396689984 = 44996^2 + 139272^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421330003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 468142 + ... + 511858.

Almost surely, 2^21421330000 is an apocalyptic number.

21421330000 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 21421330000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30166010193).

21421330000 is an abundant number, since it is smaller than the sum of its proper divisors (38910690386).

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

21421330000 is an equidigital number, since it uses as much as digits as its factorization.

21421330000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43759 (or 43731 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21421330000 its reverse (3312412), we get a palindrome (21424642412).

The spelling of 21421330000 in words is "twenty-one billion, four hundred twenty-one million, three hundred thirty thousand".