21088828907 has 8 divisors (see below), whose sum is σ = 21234756336. Its totient is φ = 20943048672.

The previous prime is 21088828867. The next prime is 21088828909. The reversal of 21088828907 is 70982888012.

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

It is a cyclic number.

It is not a de Polignac number, because 21088828907 - 2¹² = 21088824811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21088828909) 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, 258908 + ... + 330470.

It is an arithmetic number, because the mean of its divisors is an integer number (2654344542).

Almost surely, 2^21088828907 is an apocalyptic number.

21088828907 is a deficient number, since it is larger than the sum of its proper divisors (145927429).

21088828907 is a wasteful number, since it uses less digits than its factorization.

21088828907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73597.

The product of its (nonzero) digits is 1032192, while the sum is 53.

The spelling of 21088828907 in words is "twenty-one billion, eighty-eight million, eight hundred twenty-eight thousand, nine hundred seven".