1220211001 has 2 divisors, whose sum is σ = 1220211002. Its totient is φ = 1220211000.

The previous prime is 1220210977. The next prime is 1220211007. The reversal of 1220211001 is 1001120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620010000 + 600201001 = 24900^2 + 24499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220211001 - 2⁵ = 1220210969 is a prime.

It is a super-2 number, since 2×1220211001² = 2977829773922844002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1220211007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105500 + 610105501.

It is an arithmetic number, because the mean of its divisors is an integer number (610105501).

Almost surely, 2^1220211001 is an apocalyptic number.

It is an amenable number.

1220211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211001 is an equidigital number, since it uses as much as digits as its factorization.

1220211001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1220211001 is about 34931.5187330869. The cubic root of 1220211001 is about 1068.5913279207.

Adding to 1220211001 its reverse (1001120221), we get a palindrome (2221331222).

The spelling of 1220211001 in words is "one billion, two hundred twenty million, two hundred eleven thousand, one".