21330544260 has 24 divisors (see below), whose sum is σ = 59725524096. Its totient is φ = 5688145120.

The previous prime is 21330544229. The next prime is 21330544273. The reversal of 21330544260 is 6244503312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177754476 + ... + 177754595.

It is an arithmetic number, because the mean of its divisors is an integer number (2488563504).

Almost surely, 2^21330544260 is an apocalyptic number.

21330544260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330544260 is an abundant number, since it is smaller than the sum of its proper divisors (38394979836).

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

21330544260 is a wasteful number, since it uses less digits than its factorization.

21330544260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355509083 (or 355509081 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The spelling of 21330544260 in words is "twenty-one billion, three hundred thirty million, five hundred forty-four thousand, two hundred sixty".