201056221517 has 2 divisors, whose sum is σ = 201056221518. Its totient is φ = 201056221516.

The previous prime is 201056221507. The next prime is 201056221523. The reversal of 201056221517 is 715122650102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198006310441 + 3049911076 = 444979^2 + 55226^2 .

It is a cyclic number.

It is not a de Polignac number, because 201056221517 - 2⁴ = 201056221501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201056221507) 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 as a sum of consecutive naturals, namely, 100528110758 + 100528110759.

It is an arithmetic number, because the mean of its divisors is an integer number (100528110759).

Almost surely, 2^201056221517 is an apocalyptic number.

It is an amenable number.

201056221517 is a deficient number, since it is larger than the sum of its proper divisors (1).

201056221517 is an equidigital number, since it uses as much as digits as its factorization.

201056221517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 201056221517 its reverse (715122650102), we get a palindrome (916178871619).

The spelling of 201056221517 in words is "two hundred one billion, fifty-six million, two hundred twenty-one thousand, five hundred seventeen".