10313121221 has 8 divisors (see below), whose sum is σ = 11288511864. Its totient is φ = 9363741120.

The previous prime is 10313121191. The next prime is 10313121223. The reversal of 10313121221 is 12212131301.

It can be written as a sum of positive squares in 4 ways, for example, as 33189121 + 10279932100 = 5761^2 + 101390^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10313121221 - 2⁶ = 10313121157 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 10313121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10313121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6501806 + ... + 6503391.

It is an arithmetic number, because the mean of its divisors is an integer number (1411063983).

Almost surely, 2^10313121221 is an apocalyptic number.

It is an amenable number.

10313121221 is a deficient number, since it is larger than the sum of its proper divisors (975390643).

10313121221 is a wasteful number, since it uses less digits than its factorization.

10313121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13005271.

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

Adding to 10313121221 its reverse (12212131301), we get a palindrome (22525252522).

The spelling of 10313121221 in words is "ten billion, three hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-one".