221450601511 has 2 divisors, whose sum is σ = 221450601512. Its totient is φ = 221450601510.

The previous prime is 221450601497. The next prime is 221450601539. The reversal of 221450601511 is 115106054122.

221450601511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (221450601539) can be obtained adding 221450601511 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221450601511 - 2²⁹ = 220913730599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221450601511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221450601611) 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 as a sum of consecutive naturals, namely, 110725300755 + 110725300756.

It is an arithmetic number, because the mean of its divisors is an integer number (110725300756).

Almost surely, 2^221450601511 is an apocalyptic number.

221450601511 is a deficient number, since it is larger than the sum of its proper divisors (1).

221450601511 is an equidigital number, since it uses as much as digits as its factorization.

221450601511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 221450601511 its reverse (115106054122), we get a palindrome (336556655633).

The spelling of 221450601511 in words is "two hundred twenty-one billion, four hundred fifty million, six hundred one thousand, five hundred eleven".