201121021511 has 2 divisors, whose sum is σ = 201121021512. Its totient is φ = 201121021510.

The previous prime is 201121021501. The next prime is 201121021513. The reversal of 201121021511 is 115120121102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201121021511 - 2²² = 201116827207 is a prime.

Together with 201121021513, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201121021511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121021513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560510755 + 100560510756.

It is an arithmetic number, because the mean of its divisors is an integer number (100560510756).

Almost surely, 2^201121021511 is an apocalyptic number.

201121021511 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121021511 is an equidigital number, since it uses as much as digits as its factorization.

201121021511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 201121021511 its reverse (115120121102), we get a palindrome (316241142613).

The spelling of 201121021511 in words is "two hundred one billion, one hundred twenty-one million, twenty-one thousand, five hundred eleven".