21232244040 has 128 divisors (see below), whose sum is σ = 72833679360. Its totient is φ = 4850590464.

The previous prime is 21232244017. The next prime is 21232244093. The reversal of 21232244040 is 4044223212.

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 21232244040.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1996417 + ... + 2007023.

It is an arithmetic number, because the mean of its divisors is an integer number (569013120).

Almost surely, 2^21232244040 is an apocalyptic number.

21232244040 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 21232244040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36416839680).

21232244040 is an abundant number, since it is smaller than the sum of its proper divisors (51601435320).

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

21232244040 is a wasteful number, since it uses less digits than its factorization.

21232244040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13011 (or 13007 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21232244040 its reverse (4044223212), we get a palindrome (25276467252).

The spelling of 21232244040 in words is "twenty-one billion, two hundred thirty-two million, two hundred forty-four thousand, forty".