21443302140 has 96 divisors (see below), whose sum is σ = 65570674176. Its totient is φ = 5203994880.

The previous prime is 21443302103. The next prime is 21443302183. The reversal of 21443302140 is 4120334412.

It is a self number, because there is not a number n which added to its sum of digits gives 21443302140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 138222 + ... + 248981.

It is an arithmetic number, because the mean of its divisors is an integer number (683027856).

Almost surely, 2^21443302140 is an apocalyptic number.

21443302140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443302140 is an abundant number, since it is smaller than the sum of its proper divisors (44127372036).

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

21443302140 is a wasteful number, since it uses less digits than its factorization.

21443302140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387299 (or 387297 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21443302140 its reverse (4120334412), we get a palindrome (25563636552).

The spelling of 21443302140 in words is "twenty-one billion, four hundred forty-three million, three hundred two thousand, one hundred forty".