201221002121023 has 16 divisors (see below), whose sum is σ = 205955414397216. Its totient is φ = 196489089014400.

The previous prime is 201221002121021. The next prime is 201221002121039. The reversal of 201221002121023 is 320121200122102.

It is a cyclic number.

It is not a de Polignac number, because 201221002121023 - 2¹ = 201221002121021 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 (201221002121021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4779461673 + ... + 4779503773.

It is an arithmetic number, because the mean of its divisors is an integer number (12872213399826).

Almost surely, 2^{201221002121023} is an apocalyptic number.

201221002121023 is a deficient number, since it is larger than the sum of its proper divisors (4734412276193).

201221002121023 is a wasteful number, since it uses less digits than its factorization.

201221002121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69114.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 201221002121023 its reverse (320121200122102), we get a palindrome (521342202243125).

The spelling of 201221002121023 in words is "two hundred one trillion, two hundred twenty-one billion, two million, one hundred twenty-one thousand, twenty-three".