121031406561 has 12 divisors (see below), whose sum is σ = 174743569968. Its totient is φ = 74480865264.

The previous prime is 121031406547. The next prime is 121031406569. The reversal of 121031406561 is 165604130121.

It is a happy number.

It is not a de Polignac number, because 121031406561 - 2³⁰ = 119957664737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121031406569) 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 in 11 ways as a sum of consecutive naturals, for example, 119359855 + ... + 119360868.

It is an arithmetic number, because the mean of its divisors is an integer number (14561964164).

Almost surely, 2^121031406561 is an apocalyptic number.

It is an amenable number.

121031406561 is a deficient number, since it is larger than the sum of its proper divisors (53712163407).

121031406561 is a wasteful number, since it uses less digits than its factorization.

121031406561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238720752 (or 238720739 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 121031406561 its reverse (165604130121), we get a palindrome (286635536682).

The spelling of 121031406561 in words is "one hundred twenty-one billion, thirty-one million, four hundred six thousand, five hundred sixty-one".