121340420541 has 12 divisors (see below), whose sum is σ = 178576468668. Its totient is φ = 79367318784.

The previous prime is 121340420533. The next prime is 121340420561. The reversal of 121340420541 is 145024043121.

121340420541 is a `hidden beast` number, since 1 + 2 + 13 + 404 + 205 + 41 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61692127641 + 59648292900 = 248379^2 + 244230^2 .

It is not a de Polignac number, because 121340420541 - 2³ = 121340420533 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121340420561) 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 in 11 ways as a sum of consecutive naturals, for example, 127190740 + ... + 127191693.

It is an arithmetic number, because the mean of its divisors is an integer number (14881372389).

Almost surely, 2^121340420541 is an apocalyptic number.

It is an amenable number.

121340420541 is a deficient number, since it is larger than the sum of its proper divisors (57236048127).

121340420541 is a wasteful number, since it uses less digits than its factorization.

121340420541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254382492 (or 254382489 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 121340420541 its reverse (145024043121), we get a palindrome (266364463662).

The spelling of 121340420541 in words is "one hundred twenty-one billion, three hundred forty million, four hundred twenty thousand, five hundred forty-one".