10821576421 has 4 divisors (see below), whose sum is σ = 10928720844. Its totient is φ = 10714432000.

The previous prime is 10821576413. The next prime is 10821576427. The reversal of 10821576421 is 12467512801.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6321045025 + 4500531396 = 79505^2 + 67086^2 .

It is a cyclic number.

It is not a de Polignac number, because 10821576421 - 2³ = 10821576413 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 (10821576427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53572060 + ... + 53572261.

It is an arithmetic number, because the mean of its divisors is an integer number (2732180211).

Almost surely, 2^10821576421 is an apocalyptic number.

It is an amenable number.

10821576421 is a deficient number, since it is larger than the sum of its proper divisors (107144423).

10821576421 is a wasteful number, since it uses less digits than its factorization.

10821576421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107144422.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 10821576421 in words is "ten billion, eight hundred twenty-one million, five hundred seventy-six thousand, four hundred twenty-one".