201122122121021 has 4 divisors (see below), whose sum is σ = 201125232497952. Its totient is φ = 201119011744092.

The previous prime is 201122122120967. The next prime is 201122122121023. The reversal of 201122122121021 is 120121221221102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201122122121021 - 2³⁰ = 201121048379197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201122122120984 and 201122122121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122122121023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1555091471 + ... + 1555220796.

It is an arithmetic number, because the mean of its divisors is an integer number (50281308124488).

Almost surely, 2^{201122122121021} is an apocalyptic number.

It is an amenable number.

201122122121021 is a deficient number, since it is larger than the sum of its proper divisors (3110376931).

201122122121021 is an equidigital number, since it uses as much as digits as its factorization.

201122122121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110376930.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 201122122121021 its reverse (120121221221102), we get a palindrome (321243343342123).

The spelling of 201122122121021 in words is "two hundred one trillion, one hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".