201121220021111 has 16 divisors (see below), whose sum is σ = 221879441659008. Its totient is φ = 181118524089600.

The previous prime is 201121220021107. The next prime is 201121220021129. The reversal of 201121220021111 is 111120022121102.

It is a cyclic number.

It is not a de Polignac number, because 201121220021111 - 2² = 201121220021107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201121220021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121220021191) 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, 21819905 + ... + 29636981.

It is an arithmetic number, because the mean of its divisors is an integer number (13867465103688).

Almost surely, 2^{201121220021111} is an apocalyptic number.

201121220021111 is a deficient number, since it is larger than the sum of its proper divisors (20758221637897).

201121220021111 is a wasteful number, since it uses less digits than its factorization.

201121220021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7865402.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201121220021111 its reverse (111120022121102), we get a palindrome (312241242142213).

The spelling of 201121220021111 in words is "two hundred one trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, one hundred eleven".