10121220221 has 4 divisors (see below), whose sum is σ = 11567108832. Its totient is φ = 8675331612.

The previous prime is 10121220149. The next prime is 10121220233. The reversal of 10121220221 is 12202212101.

10121220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10121220221 - 2¹⁸ = 10120958077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121220196 and 10121220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121226221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722944295 + ... + 722944308.

It is an arithmetic number, because the mean of its divisors is an integer number (2891777208).

Almost surely, 2^10121220221 is an apocalyptic number.

It is an amenable number.

10121220221 is a deficient number, since it is larger than the sum of its proper divisors (1445888611).

10121220221 is an equidigital number, since it uses as much as digits as its factorization.

10121220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445888610.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10121220221 its reverse (12202212101), we get a palindrome (22323432322).

The spelling of 10121220221 in words is "ten billion, one hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".