10521491923 has 4 divisors (see below), whose sum is σ = 10528960680. Its totient is φ = 10514023168.

The previous prime is 10521491881. The next prime is 10521491951. The reversal of 10521491923 is 32919412501.

10521491923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10521491923 is a prime.

It is a super-2 number, since 2×10521491923² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10521492923) 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 3 ways as a sum of consecutive naturals, for example, 3732265 + ... + 3735082.

It is an arithmetic number, because the mean of its divisors is an integer number (2632240170).

Almost surely, 2^10521491923 is an apocalyptic number.

10521491923 is a deficient number, since it is larger than the sum of its proper divisors (7468757).

10521491923 is an equidigital number, since it uses as much as digits as its factorization.

10521491923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7468756.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 10521491923 in words is "ten billion, five hundred twenty-one million, four hundred ninety-one thousand, nine hundred twenty-three".