21144041232 has 40 divisors (see below), whose sum is σ = 54748308384. Its totient is φ = 7031729664.

The previous prime is 21144041209. The next prime is 21144041239. The reversal of 21144041232 is 23214044112.

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

It is not an unprimeable number, because it can be changed into a prime (21144041239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487878 + ... + 529445.

Almost surely, 2^21144041232 is an apocalyptic number.

It is an amenable number.

21144041232 is an abundant number, since it is smaller than the sum of its proper divisors (33604267152).

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

21144041232 is a wasteful number, since it uses less digits than its factorization.

21144041232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017767 (or 1017761 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21144041232 its reverse (23214044112), we get a palindrome (44358085344).

The spelling of 21144041232 in words is "twenty-one billion, one hundred forty-four million, forty-one thousand, two hundred thirty-two".