121201016520 has 96 divisors (see below), whose sum is σ = 386249716800. Its totient is φ = 30419069952.

The previous prime is 121201016477. The next prime is 121201016579. The reversal of 121201016520 is 25610102121.

121201016520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1712740 + ... + 1782099.

It is an arithmetic number, because the mean of its divisors is an integer number (4023434550).

Almost surely, 2^121201016520 is an apocalyptic number.

121201016520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201016520 is an abundant number, since it is smaller than the sum of its proper divisors (265048700280).

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

121201016520 is a wasteful number, since it uses less digits than its factorization.

121201016520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494887 (or 3494866 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 121201016520 its reverse (25610102121), we get a palindrome (146811118641).

The spelling of 121201016520 in words is "one hundred twenty-one billion, two hundred one million, sixteen thousand, five hundred twenty".