21443420000 has 120 divisors (see below), whose sum is σ = 53500586832. Its totient is φ = 8456000000.

The previous prime is 21443419957. The next prime is 21443420021. The reversal of 21443420000 is 2434412.

It is a super-2 number, since 2×21443420000² (a number of 21 digits) 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1412450 + ... + 1427550.

Almost surely, 2^21443420000 is an apocalyptic number.

21443420000 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 21443420000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26750293416).

21443420000 is an abundant number, since it is smaller than the sum of its proper divisors (32057166832).

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

21443420000 is an equidigital number, since it uses as much as digits as its factorization.

21443420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15202 (or 15179 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21443420000 its reverse (2434412), we get a palindrome (21445854412).

The spelling of 21443420000 in words is "twenty-one billion, four hundred forty-three million, four hundred twenty thousand".