21441301440 has 112 divisors (see below), whose sum is σ = 73312800288. Its totient is φ = 5277855744.

The previous prime is 21441301433. The next prime is 21441301457. The reversal of 21441301440 is 4410314412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21441301440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846547 + ... + 871506.

It is an arithmetic number, because the mean of its divisors is an integer number (654578574).

Almost surely, 2^21441301440 is an apocalyptic number.

21441301440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21441301440 is an abundant number, since it is smaller than the sum of its proper divisors (51871498848).

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

21441301440 is a wasteful number, since it uses less digits than its factorization.

21441301440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718086 (or 1718076 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21441301440 its reverse (4410314412), we get a palindrome (25851615852).

The spelling of 21441301440 in words is "twenty-one billion, four hundred forty-one million, three hundred one thousand, four hundred forty".