121855026345 has 128 divisors (see below), whose sum is σ = 218740967424. Its totient is φ = 57546768384.

The previous prime is 121855026317. The next prime is 121855026407. The reversal of 121855026345 is 543620558121.

It is not a de Polignac number, because 121855026345 - 2⁶ = 121855026281 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121855026297 and 121855026306.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 100456959 + ... + 100458171.

It is an arithmetic number, because the mean of its divisors is an integer number (1708913808).

Almost surely, 2^121855026345 is an apocalyptic number.

121855026345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121855026345 is a deficient number, since it is larger than the sum of its proper divisors (96885941079).

121855026345 is a wasteful number, since it uses less digits than its factorization.

121855026345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491.

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 121855026345 in words is "one hundred twenty-one billion, eight hundred fifty-five million, twenty-six thousand, three hundred forty-five".