21088207321 has 8 divisors (see below), whose sum is σ = 21660829344. Its totient is φ = 20523169920.

The previous prime is 21088207253. The next prime is 21088207333. The reversal of 21088207321 is 12370288012.

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 21088207321 - 2⁷ = 21088207193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21088207391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890520 + ... + 1901641.

It is an arithmetic number, because the mean of its divisors is an integer number (2707603668).

Almost surely, 2^21088207321 is an apocalyptic number.

It is an amenable number.

21088207321 is a deficient number, since it is larger than the sum of its proper divisors (572622023).

21088207321 is an equidigital number, since it uses as much as digits as its factorization.

21088207321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792311.

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 21088207321 in words is "twenty-one billion, eighty-eight million, two hundred seven thousand, three hundred twenty-one".