201122221621 has 2 divisors, whose sum is σ = 201122221622. Its totient is φ = 201122221620.

The previous prime is 201122221571. The next prime is 201122221649. The reversal of 201122221621 is 126122221102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148571702500 + 52550519121 = 385450^2 + 229239^2 .

It is a cyclic number.

It is not a de Polignac number, because 201122221621 - 2⁹ = 201122221109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201122221592 and 201122221601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201122221721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100561110810 + 100561110811.

It is an arithmetic number, because the mean of its divisors is an integer number (100561110811).

Almost surely, 2^201122221621 is an apocalyptic number.

It is an amenable number.

201122221621 is a deficient number, since it is larger than the sum of its proper divisors (1).

201122221621 is an equidigital number, since it uses as much as digits as its factorization.

201122221621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 201122221621 its reverse (126122221102), we get a palindrome (327244442723).

The spelling of 201122221621 in words is "two hundred one billion, one hundred twenty-two million, two hundred twenty-one thousand, six hundred twenty-one".