121202444021 has 4 divisors (see below), whose sum is σ = 121216934700. Its totient is φ = 121187953344.

The previous prime is 121202443969. The next prime is 121202444053. The reversal of 121202444021 is 120444202121.

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 67345959121 + 53856484900 = 259511^2 + 232070^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202444021 - 2¹⁴ = 121202427637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202444071) 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, 7232786 + ... + 7249523.

It is an arithmetic number, because the mean of its divisors is an integer number (30304233675).

Almost surely, 2^121202444021 is an apocalyptic number.

It is an amenable number.

121202444021 is a deficient number, since it is larger than the sum of its proper divisors (14490679).

121202444021 is an equidigital number, since it uses as much as digits as its factorization.

121202444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14490678.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 121202444021 its reverse (120444202121), we get a palindrome (241646646142).

The spelling of 121202444021 in words is "one hundred twenty-one billion, two hundred two million, four hundred forty-four thousand, twenty-one".