21324243331440 has 120 divisors (see below), whose sum is σ = 81844476805728. Its totient is φ = 4874112760320.

The previous prime is 21324243331439. The next prime is 21324243331441. The reversal of 21324243331440 is 4413334242312.

21324243331440 is a `hidden beast` number, since 2 + 1 + 3 + 242 + 43 + 331 + 4 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (21324243331439) and next prime (21324243331441).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21324243331395 and 21324243331404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324243331441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2115495291 + ... + 2115505370.

Almost surely, 2^{21324243331440} is an apocalyptic number.

21324243331440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324243331440 is an abundant number, since it is smaller than the sum of its proper divisors (60520233474288).

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

21324243331440 is a wasteful number, since it uses less digits than its factorization.

21324243331440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231000687 (or 4231000678 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

Adding to 21324243331440 its reverse (4413334242312), we get a palindrome (25737577573752).

The spelling of 21324243331440 in words is "twenty-one trillion, three hundred twenty-four billion, two hundred forty-three million, three hundred thirty-one thousand, four hundred forty".