21102443232 has 144 divisors (see below), whose sum is σ = 60709315968. Its totient is φ = 6414420480.

The previous prime is 21102443227. The next prime is 21102443239. The reversal of 21102443232 is 23234420112.

It is a happy number.

It is a super-2 number, since 2×21102443232² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102443239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1338757 + ... + 1354427.

It is an arithmetic number, because the mean of its divisors is an integer number (421592472).

Almost surely, 2^21102443232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102443232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30354657984).

21102443232 is an abundant number, since it is smaller than the sum of its proper divisors (39606872736).

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

21102443232 is a wasteful number, since it uses less digits than its factorization.

21102443232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15793 (or 15772 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21102443232 its reverse (23234420112), we get a palindrome (44336863344).

The spelling of 21102443232 in words is "twenty-one billion, one hundred two million, four hundred forty-three thousand, two hundred thirty-two".