21321031109 has 8 divisors (see below), whose sum is σ = 24961207488. Its totient is φ = 17829433440.

The previous prime is 21321031063. The next prime is 21321031139. The reversal of 21321031109 is 90113012312.

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

It is not a de Polignac number, because 21321031109 - 2²⁰ = 21319982533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321031139) 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, 37144367 + ... + 37144940.

It is an arithmetic number, because the mean of its divisors is an integer number (3120150936).

Almost surely, 2^21321031109 is an apocalyptic number.

It is an amenable number.

21321031109 is a deficient number, since it is larger than the sum of its proper divisors (3640176379).

21321031109 is an equidigital number, since it uses as much as digits as its factorization.

21321031109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74289355.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21321031109 in words is "twenty-one billion, three hundred twenty-one million, thirty-one thousand, one hundred nine".