10213121321 has 4 divisors (see below), whose sum is σ = 10998746052. Its totient is φ = 9427496592.

The previous prime is 10213121299. The next prime is 10213121329. The reversal of 10213121321 is 12312131201.

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 503778025 + 9709343296 = 22445^2 + 98536^2 .

It is a cyclic number.

It is not a de Polignac number, because 10213121321 - 2⁶ = 10213121257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10213121321.

It is not an unprimeable number, because it can be changed into a prime (10213121329) 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, 392812346 + ... + 392812371.

It is an arithmetic number, because the mean of its divisors is an integer number (2749686513).

Almost surely, 2^10213121321 is an apocalyptic number.

It is an amenable number.

10213121321 is a deficient number, since it is larger than the sum of its proper divisors (785624731).

10213121321 is an equidigital number, since it uses as much as digits as its factorization.

10213121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785624730.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 10213121321 its reverse (12312131201), we get a palindrome (22525252522).

The spelling of 10213121321 in words is "ten billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred twenty-one".