10121220321 has 4 divisors (see below), whose sum is σ = 13494960432. Its totient is φ = 6747480212.

The previous prime is 10121220293. The next prime is 10121220407. The reversal of 10121220321 is 12302212101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10121220321 - 2⁵ = 10121220289 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10121220321.

It is not an unprimeable number, because it can be changed into a prime (10121228321) 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, 1686870051 + ... + 1686870056.

It is an arithmetic number, because the mean of its divisors is an integer number (3373740108).

Almost surely, 2^10121220321 is an apocalyptic number.

It is an amenable number.

10121220321 is a deficient number, since it is larger than the sum of its proper divisors (3373740111).

10121220321 is an equidigital number, since it uses as much as digits as its factorization.

10121220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373740110.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 10121220321 its reverse (12302212101), we get a palindrome (22423432422).

The spelling of 10121220321 in words is "ten billion, one hundred twenty-one million, two hundred twenty thousand, three hundred twenty-one".