2000221997 has 2 divisors, whose sum is σ = 2000221998. Its totient is φ = 2000221996.

The previous prime is 2000221987. The next prime is 2000222047. The reversal of 2000221997 is 7991220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163219236 + 837002761 = 34106^2 + 28931^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000221997 - 2⁴ = 2000221981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000221907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000110998 + 1000110999.

It is an arithmetic number, because the mean of its divisors is an integer number (1000110999).

Almost surely, 2^2000221997 is an apocalyptic number.

It is an amenable number.

2000221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000221997 is an equidigital number, since it uses as much as digits as its factorization.

2000221997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 2000221997 is about 44723.8414830390. The cubic root of 2000221997 is about 1259.9676646191.

Adding to 2000221997 its reverse (7991220002), we get a palindrome (9991441999).

The spelling of 2000221997 in words is "two billion, two hundred twenty-one thousand, nine hundred ninety-seven".