10421331320021 has 4 divisors (see below), whose sum is σ = 11034350809452. Its totient is φ = 9808311830592.

The previous prime is 10421331319981. The next prime is 10421331320039. The reversal of 10421331320021 is 12002313312401.

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 8923130839921 + 1498200480100 = 2987161^2 + 1224010^2 .

It is a cyclic number.

It is not a de Polignac number, because 10421331320021 - 2³⁴ = 10404151450837 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 (10421331320221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306509744690 + ... + 306509744723.

It is an arithmetic number, because the mean of its divisors is an integer number (2758587702363).

Almost surely, 2^{10421331320021} is an apocalyptic number.

It is an amenable number.

10421331320021 is a deficient number, since it is larger than the sum of its proper divisors (613019489431).

10421331320021 is an equidigital number, since it uses as much as digits as its factorization.

10421331320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613019489430.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 10421331320021 its reverse (12002313312401), we get a palindrome (22423644632422).

The spelling of 10421331320021 in words is "ten trillion, four hundred twenty-one billion, three hundred thirty-one million, three hundred twenty thousand, twenty-one".