21112502240 has 96 divisors (see below), whose sum is σ = 52100568576. Its totient is φ = 8069501440.

The previous prime is 21112502237. The next prime is 21112502269. The reversal of 21112502240 is 4220521112.

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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4498295 + ... + 4502985.

It is an arithmetic number, because the mean of its divisors is an integer number (542714256).

Almost surely, 2^21112502240 is an apocalyptic number.

21112502240 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 21112502240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26050284288).

21112502240 is an abundant number, since it is smaller than the sum of its proper divisors (30988066336).

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

21112502240 is a wasteful number, since it uses less digits than its factorization.

21112502240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5952 (or 5944 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The spelling of 21112502240 in words is "twenty-one billion, one hundred twelve million, five hundred two thousand, two hundred forty".