121021255450555 has 16 divisors (see below), whose sum is σ = 145326243654144. Its totient is φ = 96749848821600.

The previous prime is 121021255450549. The next prime is 121021255450573. The reversal of 121021255450555 is 555054552120121.

It is not a de Polignac number, because 121021255450555 - 2⁵ = 121021255450523 is a prime.

It is a super-2 number, since 2×121021255450555² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483088080 + ... + 483338530.

It is an arithmetic number, because the mean of its divisors is an integer number (9082890228384).

Almost surely, 2^{121021255450555} is an apocalyptic number.

121021255450555 is a deficient number, since it is larger than the sum of its proper divisors (24304988203589).

121021255450555 is a wasteful number, since it uses less digits than its factorization.

121021255450555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317106.

The product of its (nonzero) digits is 500000, while the sum is 43.

The spelling of 121021255450555 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred fifty-five million, four hundred fifty thousand, five hundred fifty-five".