201220505221 has 16 divisors (see below), whose sum is σ = 211089371328. Its totient is φ = 191625782400.

The previous prime is 201220505203. The next prime is 201220505263. The reversal of 201220505221 is 122505022102.

It is a de Polignac number, because none of the positive numbers 2^k-201220505221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201220505192 and 201220505201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201220505621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69486 + ... + 638176.

It is an arithmetic number, because the mean of its divisors is an integer number (13193085708).

Almost surely, 2^201220505221 is an apocalyptic number.

It is an amenable number.

201220505221 is a deficient number, since it is larger than the sum of its proper divisors (9868866107).

201220505221 is a wasteful number, since it uses less digits than its factorization.

201220505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568932.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 201220505221 its reverse (122505022102), we get a palindrome (323725527323).

The spelling of 201220505221 in words is "two hundred one billion, two hundred twenty million, five hundred five thousand, two hundred twenty-one".