21200603440 has 40 divisors (see below), whose sum is σ = 52190900640. Its totient is φ = 7981403136.

The previous prime is 21200603429. The next prime is 21200603447. The reversal of 21200603440 is 4430600212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21200603447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7792980 + ... + 7795699.

It is an arithmetic number, because the mean of its divisors is an integer number (1304772516).

Almost surely, 2^21200603440 is an apocalyptic number.

21200603440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200603440 is an abundant number, since it is smaller than the sum of its proper divisors (30990297200).

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

21200603440 is a wasteful number, since it uses less digits than its factorization.

21200603440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15588709 (or 15588703 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The spelling of 21200603440 in words is "twenty-one billion, two hundred million, six hundred three thousand, four hundred forty".