21289071792 has 20 divisors (see below), whose sum is σ = 54996768920. Its totient is φ = 7096357248.

The previous prime is 21289071787. The next prime is 21289071809. The reversal of 21289071792 is 29717098212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 443522329 = 21289071792 / (2 + 1 + 2 + 8 + 9 + 0 + 7 + 1 + 7 + 9 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221761117 + ... + 221761212.

It is an arithmetic number, because the mean of its divisors is an integer number (2749838446).

Almost surely, 2^21289071792 is an apocalyptic number.

It is an amenable number.

21289071792 is an abundant number, since it is smaller than the sum of its proper divisors (33707697128).

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

21289071792 is a wasteful number, since it uses less digits than its factorization.

21289071792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443522340 (or 443522334 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 48.

The spelling of 21289071792 in words is "twenty-one billion, two hundred eighty-nine million, seventy-one thousand, seven hundred ninety-two".