1241221001 has 2 divisors, whose sum is σ = 1241221002. Its totient is φ = 1241221000.

The previous prime is 1241220989. The next prime is 1241221019. The reversal of 1241221001 is 1001221421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 889470976 + 351750025 = 29824^2 + 18755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1241221001 - 2¹⁸ = 1240958857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1241221601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620610500 + 620610501.

It is an arithmetic number, because the mean of its divisors is an integer number (620610501).

Almost surely, 2^1241221001 is an apocalyptic number.

It is an amenable number.

1241221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1241221001 is an equidigital number, since it uses as much as digits as its factorization.

1241221001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1241221001 is about 35230.9665067537. The cubic root of 1241221001 is about 1074.6895807517.

Adding to 1241221001 its reverse (1001221421), we get a palindrome (2242442422).

The spelling of 1241221001 in words is "one billion, two hundred forty-one million, two hundred twenty-one thousand, one".