121552049821 has 2 divisors, whose sum is σ = 121552049822. Its totient is φ = 121552049820.

The previous prime is 121552049789. The next prime is 121552049873. The reversal of 121552049821 is 128940255121.

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., 64103150596 + 57448899225 = 253186^2 + 239685^2 .

It is a cyclic number.

It is not a de Polignac number, because 121552049821 - 2⁵ = 121552049789 is a prime.

It is a super-2 number, since 2×121552049821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121552049321) 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, 60776024910 + 60776024911.

It is an arithmetic number, because the mean of its divisors is an integer number (60776024911).

Almost surely, 2^121552049821 is an apocalyptic number.

It is an amenable number.

121552049821 is a deficient number, since it is larger than the sum of its proper divisors (1).

121552049821 is an equidigital number, since it uses as much as digits as its factorization.

121552049821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 121552049821 in words is "one hundred twenty-one billion, five hundred fifty-two million, forty-nine thousand, eight hundred twenty-one".