21225108709 has 8 divisors (see below), whose sum is σ = 24264161280. Its totient is φ = 18187779696.

The previous prime is 21225108659. The next prime is 21225108727. The reversal of 21225108709 is 90780152212.

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 21225108709 - 2⁷ = 21225108581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225408709) 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, 404389 + ... + 453850.

It is an arithmetic number, because the mean of its divisors is an integer number (3033020160).

Almost surely, 2^21225108709 is an apocalyptic number.

It is an amenable number.

21225108709 is a deficient number, since it is larger than the sum of its proper divisors (3039052571).

21225108709 is an equidigital number, since it uses as much as digits as its factorization.

21225108709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861779.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 21225108709 in words is "twenty-one billion, two hundred twenty-five million, one hundred eight thousand, seven hundred nine".