21107414240 has 144 divisors (see below), whose sum is σ = 55980300096. Its totient is φ = 7511792640.

The previous prime is 21107414131. The next prime is 21107414267. The reversal of 21107414240 is 4241470112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 898322 + ... + 921518.

It is an arithmetic number, because the mean of its divisors is an integer number (388752084).

Almost surely, 2^21107414240 is an apocalyptic number.

21107414240 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 21107414240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27990150048).

21107414240 is an abundant number, since it is smaller than the sum of its proper divisors (34872885856).

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

21107414240 is a wasteful number, since it uses less digits than its factorization.

21107414240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23281 (or 23262 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

Adding to 21107414240 its reverse (4241470112), we get a palindrome (25348884352).

The spelling of 21107414240 in words is "twenty-one billion, one hundred seven million, four hundred fourteen thousand, two hundred forty".