10931785921 has 8 divisors (see below), whose sum is σ = 12500307584. Its totient is φ = 9364973760.

The previous prime is 10931785919. The next prime is 10931785937. The reversal of 10931785921 is 12958713901.

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 10931785921 - 2¹ = 10931785919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10931785321) 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, 413640 + ... + 439273.

It is an arithmetic number, because the mean of its divisors is an integer number (1562538448).

Almost surely, 2^10931785921 is an apocalyptic number.

It is an amenable number.

10931785921 is a deficient number, since it is larger than the sum of its proper divisors (1568521663).

10931785921 is an equidigital number, since it uses as much as digits as its factorization.

10931785921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854751.

The product of its (nonzero) digits is 136080, while the sum is 46.

The spelling of 10931785921 in words is "ten billion, nine hundred thirty-one million, seven hundred eighty-five thousand, nine hundred twenty-one".