121556225670 has 128 divisors (see below), whose sum is σ = 342806888448. Its totient is φ = 27277641600.

The previous prime is 121556225669. The next prime is 121556225677. The reversal of 121556225670 is 76522655121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121556225677) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 23022 + ... + 493601.

It is an arithmetic number, because the mean of its divisors is an integer number (2678178816).

Almost surely, 2^121556225670 is an apocalyptic number.

121556225670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121556225670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171403444224).

121556225670 is an abundant number, since it is smaller than the sum of its proper divisors (221250662778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121556225670 is a wasteful number, since it uses less digits than its factorization.

121556225670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516698.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 121556225670 in words is "one hundred twenty-one billion, five hundred fifty-six million, two hundred twenty-five thousand, six hundred seventy".