121020326555 has 16 divisors (see below), whose sum is σ = 149782760064. Its totient is φ = 93818140800.

The previous prime is 121020326513. The next prime is 121020326573. The reversal of 121020326555 is 555623020121.

It is a de Polignac number, because none of the positive numbers 2^k-121020326555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2525672 + ... + 2573141.

It is an arithmetic number, because the mean of its divisors is an integer number (9361422504).

Almost surely, 2^121020326555 is an apocalyptic number.

121020326555 is a deficient number, since it is larger than the sum of its proper divisors (28762433509).

121020326555 is a wasteful number, since it uses less digits than its factorization.

121020326555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5098966.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 121020326555 its reverse (555623020121), we get a palindrome (676643346676).

The spelling of 121020326555 in words is "one hundred twenty-one billion, twenty million, three hundred twenty-six thousand, five hundred fifty-five".