21280348164 has 24 divisors (see below), whose sum is σ = 51255893248. Its totient is φ = 6864628320.

The previous prime is 21280348151. The next prime is 21280348181. The reversal of 21280348164 is 46184308212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28602247 + ... + 28602990.

Almost surely, 2^21280348164 is an apocalyptic number.

It is an amenable number.

21280348164 is an abundant number, since it is smaller than the sum of its proper divisors (29975545084).

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

21280348164 is a wasteful number, since it uses less digits than its factorization.

21280348164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57205275 (or 57205273 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 21280348164 in words is "twenty-one billion, two hundred eighty million, three hundred forty-eight thousand, one hundred sixty-four".