201220511511 has 32 divisors (see below), whose sum is σ = 278519270848. Its totient is φ = 129113948160.

The previous prime is 201220511423. The next prime is 201220511549. The reversal of 201220511511 is 115115022102.

It is not a de Polignac number, because 201220511511 - 2²² = 201216317207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220511561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35668251 + ... + 35673891.

It is an arithmetic number, because the mean of its divisors is an integer number (8703727214).

Almost surely, 2^201220511511 is an apocalyptic number.

201220511511 is a deficient number, since it is larger than the sum of its proper divisors (77298759337).

201220511511 is a wasteful number, since it uses less digits than its factorization.

201220511511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 201220511511 its reverse (115115022102), we get a palindrome (316335533613).

The spelling of 201220511511 in words is "two hundred one billion, two hundred twenty million, five hundred eleven thousand, five hundred eleven".