21443430140 has 48 divisors (see below), whose sum is σ = 49716858240. Its totient is φ = 7703657280.

The previous prime is 21443430109. The next prime is 21443430163. The reversal of 21443430140 is 4103434412.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 568910 + ... + 605429.

It is an arithmetic number, because the mean of its divisors is an integer number (1035767880).

Almost surely, 2^21443430140 is an apocalyptic number.

21443430140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443430140 is an abundant number, since it is smaller than the sum of its proper divisors (28273428100).

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

21443430140 is a wasteful number, since it uses less digits than its factorization.

21443430140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174442 (or 1174440 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21443430140 its reverse (4103434412), we get a palindrome (25546864552).

The spelling of 21443430140 in words is "twenty-one billion, four hundred forty-three million, four hundred thirty thousand, one hundred forty".