221021119123949 has 2 divisors, whose sum is σ = 221021119123950. Its totient is φ = 221021119123948.

The previous prime is 221021119123913. The next prime is 221021119123967. The reversal of 221021119123949 is 949321911120122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209565635809924 + 11455483314025 = 14476382^2 + 3384595^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021119123949 - 2²⁸ = 221020850688493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021119123979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510559561974 + 110510559561975.

It is an arithmetic number, because the mean of its divisors is an integer number (110510559561975).

Almost surely, 2^{221021119123949} is an apocalyptic number.

It is an amenable number.

221021119123949 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021119123949 is an equidigital number, since it uses as much as digits as its factorization.

221021119123949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 47.

The spelling of 221021119123949 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred nineteen million, one hundred twenty-three thousand, nine hundred forty-nine".