200221217957 has 2 divisors, whose sum is σ = 200221217958. Its totient is φ = 200221217956.

The previous prime is 200221217927. The next prime is 200221217971. The reversal of 200221217957 is 759712122002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144522385921 + 55698832036 = 380161^2 + 236006^2 .

It is a cyclic number.

It is not a de Polignac number, because 200221217957 - 2²⁰ = 200220169381 is a prime.

It is a super-2 number, since 2×200221217957² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 200221217957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200221217927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100110608978 + 100110608979.

It is an arithmetic number, because the mean of its divisors is an integer number (100110608979).

Almost surely, 2^200221217957 is an apocalyptic number.

It is an amenable number.

200221217957 is a deficient number, since it is larger than the sum of its proper divisors (1).

200221217957 is an equidigital number, since it uses as much as digits as its factorization.

200221217957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 38.

Adding to 200221217957 its reverse (759712122002), we get a palindrome (959933339959).

The spelling of 200221217957 in words is "two hundred billion, two hundred twenty-one million, two hundred seventeen thousand, nine hundred fifty-seven".