201121211023 has 4 divisors (see below), whose sum is σ = 203953904208. Its totient is φ = 198288517840.

The previous prime is 201121211009. The next prime is 201121211029. The reversal of 201121211023 is 320112121102.

201121211023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201121211023 - 2²⁵ = 201087656591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121210988 and 201121211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121211029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1416346486 + ... + 1416346627.

It is an arithmetic number, because the mean of its divisors is an integer number (50988476052).

Almost surely, 2^201121211023 is an apocalyptic number.

201121211023 is a deficient number, since it is larger than the sum of its proper divisors (2832693185).

201121211023 is an equidigital number, since it uses as much as digits as its factorization.

201121211023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2832693184.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 201121211023 its reverse (320112121102), we get a palindrome (521233332125).

It can be divided in two parts, 20112121102 and 3, that multiplied together give a palindrome (60336363306).

The spelling of 201121211023 in words is "two hundred one billion, one hundred twenty-one million, two hundred eleven thousand, twenty-three".