121201121010021 has 24 divisors (see below), whose sum is σ = 176624008310880. Its totient is φ = 73888246276416.

The previous prime is 121201121009981. The next prime is 121201121010029. The reversal of 121201121010021 is 120010121102121.

It is a happy number.

It is not a de Polignac number, because 121201121010021 - 2¹⁰ = 121201121008997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201121010029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1117027366 + ... + 1117135863.

It is an arithmetic number, because the mean of its divisors is an integer number (7359333679620).

Almost surely, 2^{121201121010021} is an apocalyptic number.

It is an amenable number.

121201121010021 is a deficient number, since it is larger than the sum of its proper divisors (55422887300859).

121201121010021 is a wasteful number, since it uses less digits than its factorization.

121201121010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234163365 (or 2234163352 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121201121010021 its reverse (120010121102121), we get a palindrome (241211242112142).

The spelling of 121201121010021 in words is "one hundred twenty-one trillion, two hundred one billion, one hundred twenty-one million, ten thousand, twenty-one".