21124310240 has 48 divisors (see below), whose sum is σ = 54443113200. Its totient is φ = 7681566720.

The previous prime is 21124310237. The next prime is 21124310261. The reversal of 21124310240 is 4201342112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5999465 + ... + 6002984.

It is an arithmetic number, because the mean of its divisors is an integer number (1134231525).

Almost surely, 2^21124310240 is an apocalyptic number.

21124310240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124310240 is an abundant number, since it is smaller than the sum of its proper divisors (33318802960).

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

21124310240 is a wasteful number, since it uses less digits than its factorization.

21124310240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12002475 (or 12002467 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21124310240 its reverse (4201342112), we get a palindrome (25325652352).

The spelling of 21124310240 in words is "twenty-one billion, one hundred twenty-four million, three hundred ten thousand, two hundred forty".