21443244020 has 24 divisors (see below), whose sum is σ = 49124523168. Its totient is φ = 7797543200.

The previous prime is 21443244013. The next prime is 21443244041. The reversal of 21443244020 is 2044234412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48734426 + ... + 48734865.

It is an arithmetic number, because the mean of its divisors is an integer number (2046855132).

Almost surely, 2^21443244020 is an apocalyptic number.

21443244020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443244020 is an abundant number, since it is smaller than the sum of its proper divisors (27681279148).

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

21443244020 is a wasteful number, since it uses less digits than its factorization.

21443244020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97469311 (or 97469309 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21443244020 its reverse (2044234412), we get a palindrome (23487478432).

It can be divided in two parts, 214 and 43244020, that added together give a palindrome (43244234).

The spelling of 21443244020 in words is "twenty-one billion, four hundred forty-three million, two hundred forty-four thousand, twenty".