121755415470 has 128 divisors (see below), whose sum is σ = 328087355904. Its totient is φ = 28721032704.

The previous prime is 121755415387. The next prime is 121755415477. The reversal of 121755415470 is 74514557121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121755415477) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 820317 + ... + 957303.

It is an arithmetic number, because the mean of its divisors is an integer number (2563182468).

Almost surely, 2^121755415470 is an apocalyptic number.

121755415470 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 121755415470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164043677952).

121755415470 is an abundant number, since it is smaller than the sum of its proper divisors (206331940434).

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

121755415470 is a wasteful number, since it uses less digits than its factorization.

121755415470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137106.

The product of its (nonzero) digits is 196000, while the sum is 42.

The spelling of 121755415470 in words is "one hundred twenty-one billion, seven hundred fifty-five million, four hundred fifteen thousand, four hundred seventy".