121021255450455 has 16 divisors (see below), whose sum is σ = 195443672356224. Its totient is φ = 63941448361760.

The previous prime is 121021255450339. The next prime is 121021255450477. The reversal of 121021255450455 is 554054552120121.

It is not a de Polignac number, because 121021255450455 - 2¹² = 121021255446359 is a prime.

It is a super-2 number, since 2×121021255450455² (a number of 29 digits) contains 22 as substring.

It is a congruent 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, 37701324081 + ... + 37701327290.

It is an arithmetic number, because the mean of its divisors is an integer number (12215229522264).

Almost surely, 2^{121021255450455} is an apocalyptic number.

121021255450455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121021255450455 is a deficient number, since it is larger than the sum of its proper divisors (74422416905769).

121021255450455 is a wasteful number, since it uses less digits than its factorization.

121021255450455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75402651486.

The product of its (nonzero) digits is 400000, while the sum is 42.

The spelling of 121021255450455 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred fifty-five million, four hundred fifty thousand, four hundred fifty-five".