121210313221 has 4 divisors (see below), whose sum is σ = 121211887212. Its totient is φ = 121208739232.

The previous prime is 121210313219. The next prime is 121210313227. The reversal of 121210313221 is 122313012121.

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 33187730625 + 88022582596 = 182175^2 + 296686^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210313221 - 2¹ = 121210313219 is a prime.

It is a super-2 number, since 2×121210313221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210313227) 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, 665200 + ... + 827593.

It is an arithmetic number, because the mean of its divisors is an integer number (30302971803).

Almost surely, 2^121210313221 is an apocalyptic number.

It is an amenable number.

121210313221 is a deficient number, since it is larger than the sum of its proper divisors (1573991).

121210313221 is an equidigital number, since it uses as much as digits as its factorization.

121210313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573990.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121210313221 its reverse (122313012121), we get a palindrome (243523325342).

The spelling of 121210313221 in words is "one hundred twenty-one billion, two hundred ten million, three hundred thirteen thousand, two hundred twenty-one".