121202001221 has 12 divisors (see below), whose sum is σ = 147120088032. Its totient is φ = 99370583928.

The previous prime is 121202001203. The next prime is 121202001241. The reversal of 121202001221 is 122100202121.

It is not a de Polignac number, because 121202001221 - 2²⁶ = 121134892357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121202001196 and 121202001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202001241) 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 11 ways as a sum of consecutive naturals, for example, 53770835 + ... + 53773088.

It is an arithmetic number, because the mean of its divisors is an integer number (12260007336).

Almost surely, 2^121202001221 is an apocalyptic number.

It is an amenable number.

121202001221 is a deficient number, since it is larger than the sum of its proper divisors (25918086811).

121202001221 is a wasteful number, since it uses less digits than its factorization.

121202001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107543960 (or 107543953 counting only the distinct ones).

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

Adding to 121202001221 its reverse (122100202121), we get a palindrome (243302203342).

Subtracting 121202001221 from its reverse (122100202121), we obtain a square (898200900 = 29970²).

The spelling of 121202001221 in words is "one hundred twenty-one billion, two hundred two million, one thousand, two hundred twenty-one".