21925309289 has 8 divisors (see below), whose sum is σ = 23613025800. Its totient is φ = 20237757696.

The previous prime is 21925309279. The next prime is 21925309297. The reversal of 21925309289 is 98290352912.

It can be written as a sum of positive squares in 4 ways, for example, as 3047923264 + 18877386025 = 55208^2 + 137395^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21925309289 - 2⁸ = 21925309033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21925309279) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 467039 + ... + 511835.

It is an arithmetic number, because the mean of its divisors is an integer number (2951628225).

Almost surely, 2^21925309289 is an apocalyptic number.

It is an amenable number.

21925309289 is a deficient number, since it is larger than the sum of its proper divisors (1687716511).

21925309289 is a wasteful number, since it uses less digits than its factorization.

21925309289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82459.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 21925309289 in words is "twenty-one billion, nine hundred twenty-five million, three hundred nine thousand, two hundred eighty-nine".