10401321421 has 4 divisors (see below), whose sum is σ = 10402883100. Its totient is φ = 10399759744.

The previous prime is 10401321389. The next prime is 10401321443. The reversal of 10401321421 is 12412310401.

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 5143041225 + 5258280196 = 71715^2 + 72514^2 .

It is a cyclic number.

It is not a de Polignac number, because 10401321421 - 2⁵ = 10401321389 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 (10401121421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770806 + ... + 784183.

It is an arithmetic number, because the mean of its divisors is an integer number (2600720775).

Almost surely, 2^10401321421 is an apocalyptic number.

It is an amenable number.

10401321421 is a deficient number, since it is larger than the sum of its proper divisors (1561679).

10401321421 is an equidigital number, since it uses as much as digits as its factorization.

10401321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561678.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 10401321421 its reverse (12412310401), we get a palindrome (22813631822).

The spelling of 10401321421 in words is "ten billion, four hundred one million, three hundred twenty-one thousand, four hundred twenty-one".