21331201310232 has 128 divisors (see below), whose sum is σ = 60059360286720. Its totient is φ = 6254785152000.

The previous prime is 21331201310227. The next prime is 21331201310297. The reversal of 21331201310232 is 23201310213312.

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

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 75487318 + ... + 75769370.

It is an arithmetic number, because the mean of its divisors is an integer number (469213752240).

Almost surely, 2^{21331201310232} is an apocalyptic number.

21331201310232 is a gapful number since it is divisible by the number (22) 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 21331201310232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30029680143360).

21331201310232 is an abundant number, since it is smaller than the sum of its proper divisors (38728158976488).

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

21331201310232 is a wasteful number, since it uses less digits than its factorization.

21331201310232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291345 (or 291341 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21331201310232 its reverse (23201310213312), we get a palindrome (44532511523544).

The spelling of 21331201310232 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred one million, three hundred ten thousand, two hundred thirty-two".