121221221222001 has 4 divisors (see below), whose sum is σ = 161628294962672. Its totient is φ = 80814147481332.

The previous prime is 121221221221951. The next prime is 121221221222027. The reversal of 121221221222001 is 100222122122121.

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 not a de Polignac number, because 121221221222001 - 2¹⁹ = 121221220697713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221221222051) 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, 20203536870331 + ... + 20203536870336.

It is an arithmetic number, because the mean of its divisors is an integer number (40407073740668).

Almost surely, 2^{121221221222001} is an apocalyptic number.

It is an amenable number.

121221221222001 is a deficient number, since it is larger than the sum of its proper divisors (40407073740671).

121221221222001 is an equidigital number, since it uses as much as digits as its factorization.

121221221222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40407073740670.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 121221221222001 its reverse (100222122122121), we get a palindrome (221443343344122).

The spelling of 121221221222001 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one".