21107825321 has 8 divisors (see below), whose sum is σ = 23769516288. Its totient is φ = 18569934000.

The previous prime is 21107825317. The next prime is 21107825381. The reversal of 21107825321 is 12352870112.

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 21107825321 - 2² = 21107825317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21107825381) 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, 30949550 + ... + 30950231.

It is an arithmetic number, because the mean of its divisors is an integer number (2971189536).

Almost surely, 2^21107825321 is an apocalyptic number.

It is an amenable number.

21107825321 is a deficient number, since it is larger than the sum of its proper divisors (2661690967).

21107825321 is a wasteful number, since it uses less digits than its factorization.

21107825321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61899823.

The product of its (nonzero) digits is 6720, while the sum is 32.

The spelling of 21107825321 in words is "twenty-one billion, one hundred seven million, eight hundred twenty-five thousand, three hundred twenty-one".