121540611361 has 24 divisors (see below), whose sum is σ = 137735506496. Its totient is φ = 106601853600.

The previous prime is 121540611343. The next prime is 121540611431. The reversal of 121540611361 is 163116045121.

It is not a de Polignac number, because 121540611361 - 2¹¹ = 121540609313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121540611331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 979906 + ... + 1096948.

Almost surely, 2^121540611361 is an apocalyptic number.

It is an amenable number.

121540611361 is a deficient number, since it is larger than the sum of its proper divisors (16194895135).

121540611361 is a wasteful number, since it uses less digits than its factorization.

121540611361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117253 (or 117230 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 121540611361 its reverse (163116045121), we get a palindrome (284656656482).

The spelling of 121540611361 in words is "one hundred twenty-one billion, five hundred forty million, six hundred eleven thousand, three hundred sixty-one".