121521545716000 has 96 divisors (see below), whose sum is σ = 298593866359152. Its totient is φ = 48606106521600.

The previous prime is 121521545715989. The next prime is 121521545716003. The reversal of 121521545716000 is 617545125121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3881230967056 + 117640314748944 = 1970084^2 + 10846212^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (121521545716003) 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, 77612872 + ... + 79163128.

Almost surely, 2^{121521545716000} is an apocalyptic number.

121521545716000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121521545716000 is an abundant number, since it is smaller than the sum of its proper divisors (177072320643152).

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

121521545716000 is a wasteful number, since it uses less digits than its factorization.

121521545716000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569879 (or 1569861 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 121521545716000 in words is "one hundred twenty-one trillion, five hundred twenty-one billion, five hundred forty-five million, seven hundred sixteen thousand".