1221000220049 has 2 divisors, whose sum is σ = 1221000220050. Its totient is φ = 1221000220048.

The previous prime is 1221000219983. The next prime is 1221000220057. The reversal of 1221000220049 is 9400220001221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 734817556225 + 486182663824 = 857215^2 + 697268^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221000220049 - 2³² = 1216705252753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221000220079) 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, 610500110024 + 610500110025.

It is an arithmetic number, because the mean of its divisors is an integer number (610500110025).

Almost surely, 2^{1221000220049} is an apocalyptic number.

It is an amenable number.

1221000220049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221000220049 is an equidigital number, since it uses as much as digits as its factorization.

1221000220049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 1221000220049 in words is "one trillion, two hundred twenty-one billion, two hundred twenty thousand, forty-nine".