21063330240 has 56 divisors (see below), whose sum is σ = 66876076560. Its totient is φ = 5616887808.

The previous prime is 21063330217. The next prime is 21063330269. The reversal of 21063330240 is 4203336012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21063330240.

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, 10969525 + ... + 10971444.

Almost surely, 2^21063330240 is an apocalyptic number.

21063330240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21063330240 is an abundant number, since it is smaller than the sum of its proper divisors (45812746320).

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

21063330240 is a wasteful number, since it uses less digits than its factorization.

21063330240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21940989 (or 21940979 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21063330240 its reverse (4203336012), we get a palindrome (25266666252).

The spelling of 21063330240 in words is "twenty-one billion, sixty-three million, three hundred thirty thousand, two hundred forty".