121021020949 has 2 divisors, whose sum is σ = 121021020950. Its totient is φ = 121021020948.

The previous prime is 121021020929. The next prime is 121021021021. The reversal of 121021020949 is 949020120121.

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., 80536764100 + 40484256849 = 283790^2 + 201207^2 .

It is a cyclic number.

It is not a de Polignac number, because 121021020949 - 2¹¹ = 121021018901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121021020949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021020919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510510474 + 60510510475.

It is an arithmetic number, because the mean of its divisors is an integer number (60510510475).

Almost surely, 2^121021020949 is an apocalyptic number.

It is an amenable number.

121021020949 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021020949 is an equidigital number, since it uses as much as digits as its factorization.

121021020949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 121021020949 in words is "one hundred twenty-one billion, twenty-one million, twenty thousand, nine hundred forty-nine".