121655010026 has 24 divisors (see below), whose sum is σ = 209300831712. Its totient is φ = 52893480200.

The previous prime is 121655009999. The next prime is 121655010041. The reversal of 121655010026 is 620010556121.

It is a happy number.

It is an unprimeable number.

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, 10922840 + ... + 10933971.

It is an arithmetic number, because the mean of its divisors is an integer number (8720867988).

Almost surely, 2^121655010026 is an apocalyptic number.

121655010026 is a deficient number, since it is larger than the sum of its proper divisors (87645821686).

121655010026 is a wasteful number, since it uses less digits than its factorization.

121655010026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21856858 (or 21856847 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 121655010026 its reverse (620010556121), we get a palindrome (741665566147).

The spelling of 121655010026 in words is "one hundred twenty-one billion, six hundred fifty-five million, ten thousand, twenty-six".