21246005240 has 32 divisors (see below), whose sum is σ = 48340638000. Its totient is φ = 8402913024.

The previous prime is 21246005239. The next prime is 21246005269. The reversal of 21246005240 is 4250064212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2980430 + ... + 2987549.

Almost surely, 2^21246005240 is an apocalyptic number.

21246005240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21246005240 is an abundant number, since it is smaller than the sum of its proper divisors (27094632760).

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

21246005240 is a wasteful number, since it uses less digits than its factorization.

21246005240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5968079 (or 5968075 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21246005240 its reverse (4250064212), we get a palindrome (25496069452).

The spelling of 21246005240 in words is "twenty-one billion, two hundred forty-six million, five thousand, two hundred forty".