21466440240 has 80 divisors (see below), whose sum is σ = 76052537088. Its totient is φ = 4906614528.

The previous prime is 21466440199. The next prime is 21466440251. The reversal of 21466440240 is 4204466412.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6387142 + ... + 6390501.

Almost surely, 2^21466440240 is an apocalyptic number.

21466440240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21466440240 is an abundant number, since it is smaller than the sum of its proper divisors (54586096848).

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

21466440240 is a wasteful number, since it uses less digits than its factorization.

21466440240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12777666 (or 12777660 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 33.

The spelling of 21466440240 in words is "twenty-one billion, four hundred sixty-six million, four hundred forty thousand, two hundred forty".