121647545520 has 80 divisors (see below), whose sum is σ = 379638424800. Its totient is φ = 32221622272.

The previous prime is 121647545497. The next prime is 121647545527. The reversal of 121647545520 is 25545746121.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (121647545527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1665129 + ... + 1736648.

It is an arithmetic number, because the mean of its divisors is an integer number (4745480310).

Almost surely, 2^121647545520 is an apocalyptic number.

121647545520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121647545520 is an abundant number, since it is smaller than the sum of its proper divisors (257990879280).

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

121647545520 is a wasteful number, since it uses less digits than its factorization.

121647545520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401942 (or 3401936 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 42.

The spelling of 121647545520 in words is "one hundred twenty-one billion, six hundred forty-seven million, five hundred forty-five thousand, five hundred twenty".