201121021111 has 2 divisors, whose sum is σ = 201121021112. Its totient is φ = 201121021110.

The previous prime is 201121021061. The next prime is 201121021159. The reversal of 201121021111 is 111120121102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201121021111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201121021091 and 201121021100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121021511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560510555 + 100560510556.

It is an arithmetic number, because the mean of its divisors is an integer number (100560510556).

Almost surely, 2^201121021111 is an apocalyptic number.

201121021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121021111 is an equidigital number, since it uses as much as digits as its factorization.

201121021111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201121021111 its reverse (111120121102), we get a palindrome (312241142213).

Subtracting from 201121021111 its reverse (111120121102), we obtain a palindrome (90000900009).

The spelling of 201121021111 in words is "two hundred one billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".