20000221001 has 2 divisors, whose sum is σ = 20000221002. Its totient is φ = 20000221000.

The previous prime is 20000220983. The next prime is 20000221027. The reversal of 20000221001 is 10012200002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10998765625 + 9001455376 = 104875^2 + 94876^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000221001 - 2²⁶ = 19933112137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20000221001.

It is not a weakly prime, because it can be changed into another prime (20000221061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000110500 + 10000110501.

It is an arithmetic number, because the mean of its divisors is an integer number (10000110501).

Almost surely, 2^20000221001 is an apocalyptic number.

It is an amenable number.

20000221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000221001 is an equidigital number, since it uses as much as digits as its factorization.

20000221001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 20000221001 its reverse (10012200002), we get a palindrome (30012421003).

The spelling of 20000221001 in words is "twenty billion, two hundred twenty-one thousand, one".