1221005041 has 2 divisors, whose sum is σ = 1221005042. Its totient is φ = 1221005040.

The previous prime is 1221004913. The next prime is 1221005063. The reversal of 1221005041 is 1405001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071187441 + 149817600 = 32729^2 + 12240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221005041 - 2⁷ = 1221004913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221003041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610502520 + 610502521.

It is an arithmetic number, because the mean of its divisors is an integer number (610502521).

Almost surely, 2^1221005041 is an apocalyptic number.

It is an amenable number.

1221005041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221005041 is an equidigital number, since it uses as much as digits as its factorization.

1221005041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1221005041 is about 34942.8825513866. The cubic root of 1221005041 is about 1068.8230693359.

Adding to 1221005041 its reverse (1405001221), we get a palindrome (2626006262).

The spelling of 1221005041 in words is "one billion, two hundred twenty-one million, five thousand, forty-one".