21140424432 has 120 divisors (see below), whose sum is σ = 59856139200. Its totient is φ = 6964683264.

The previous prime is 21140424427. The next prime is 21140424439. The reversal of 21140424432 is 23442404112.

21140424432 is a `hidden beast` number, since 2 + 11 + 404 + 244 + 3 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21140424396 and 21140424405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140424439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7265794 + ... + 7268702.

It is an arithmetic number, because the mean of its divisors is an integer number (498801160).

Almost surely, 2^21140424432 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 21140424432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29928069600).

21140424432 is an abundant number, since it is smaller than the sum of its proper divisors (38715714768).

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

21140424432 is a wasteful number, since it uses less digits than its factorization.

21140424432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495 (or 3486 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21140424432 its reverse (23442404112), we get a palindrome (44582828544).

The spelling of 21140424432 in words is "twenty-one billion, one hundred forty million, four hundred twenty-four thousand, four hundred thirty-two".