10109091821 has 8 divisors (see below), whose sum is σ = 10232853120. Its totient is φ = 9985377472.

The previous prime is 10109091809. The next prime is 10109091833. The reversal of 10109091821 is 12819090101.

It is an interprime number because it is at equal distance from previous prime (10109091809) and next prime (10109091833).

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 10109091821 - 2¹⁸ = 10108829677 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 (10109091841) 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, 641525 + ... + 657093.

It is an arithmetic number, because the mean of its divisors is an integer number (1279106640).

Almost surely, 2^10109091821 is an apocalyptic number.

It is an amenable number.

10109091821 is a deficient number, since it is larger than the sum of its proper divisors (123761299).

10109091821 is an equidigital number, since it uses as much as digits as its factorization.

10109091821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23475.

The product of its (nonzero) digits is 1296, while the sum is 32.

The spelling of 10109091821 in words is "ten billion, one hundred nine million, ninety-one thousand, eight hundred twenty-one".