21440550132440 has 32 divisors (see below), whose sum is σ = 51078957670080. Its totient is φ = 8071736520192.

The previous prime is 21440550132349. The next prime is 21440550132467. The reversal of 21440550132440 is 4423105504412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21440550132440.

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, 15765109712 + ... + 15765111071.

It is an arithmetic number, because the mean of its divisors is an integer number (1596217427190).

Almost surely, 2^{21440550132440} is an apocalyptic number.

21440550132440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440550132440 is an abundant number, since it is smaller than the sum of its proper divisors (29638407537640).

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

21440550132440 is a wasteful number, since it uses less digits than its factorization.

21440550132440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31530220811 (or 31530220807 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21440550132440 its reverse (4423105504412), we get a palindrome (25863655636852).

The spelling of 21440550132440 in words is "twenty-one trillion, four hundred forty billion, five hundred fifty million, one hundred thirty-two thousand, four hundred forty".