21221332423240 has 256 divisors, whose sum is σ = 51764625158400. Its totient is φ = 7814036127744.

The previous prime is 21221332423223. The next prime is 21221332423267. The reversal of 21221332423240 is 4232423312212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353170239 + ... + 353230321.

It is an arithmetic number, because the mean of its divisors is an integer number (202205567025).

Almost surely, 2^{21221332423240} is an apocalyptic number.

21221332423240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221332423240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25882312579200).

21221332423240 is an abundant number, since it is smaller than the sum of its proper divisors (30543292735160).

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

21221332423240 is a wasteful number, since it uses less digits than its factorization.

21221332423240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60336 (or 60332 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21221332423240 its reverse (4232423312212), we get a palindrome (25453755735452).

The spelling of 21221332423240 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred thirty-two million, four hundred twenty-three thousand, two hundred forty".