121221011210221 has 16 divisors (see below), whose sum is σ = 130932013464000. Its totient is φ = 111565245714048.

The previous prime is 121221011210203. The next prime is 121221011210239. The reversal of 121221011210221 is 122012110122121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121221011210203) and next prime (121221011210239).

It is a cyclic number.

It is not a de Polignac number, because 121221011210221 - 2⁹ = 121221011209709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221011210281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57834370 + ... + 59893708.

It is an arithmetic number, because the mean of its divisors is an integer number (8183250841500).

Almost surely, 2^{121221011210221} is an apocalyptic number.

It is an amenable number.

121221011210221 is a deficient number, since it is larger than the sum of its proper divisors (9711002253779).

121221011210221 is a wasteful number, since it uses less digits than its factorization.

121221011210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072748.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121221011210221 its reverse (122012110122121), we get a palindrome (243233121332342).

The spelling of 121221011210221 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, eleven million, two hundred ten thousand, two hundred twenty-one".