10421548921 has 4 divisors (see below), whose sum is σ = 11910341632. Its totient is φ = 8932756212.

The previous prime is 10421548867. The next prime is 10421548967. The reversal of 10421548921 is 12984512401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10421548921 - 2⁹ = 10421548409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10421548021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744396345 + ... + 744396358.

It is an arithmetic number, because the mean of its divisors is an integer number (2977585408).

Almost surely, 2^10421548921 is an apocalyptic number.

It is an amenable number.

10421548921 is a deficient number, since it is larger than the sum of its proper divisors (1488792711).

10421548921 is an equidigital number, since it uses as much as digits as its factorization.

10421548921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488792710.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 10421548921 in words is "ten billion, four hundred twenty-one million, five hundred forty-eight thousand, nine hundred twenty-one".