121512533020 has 48 divisors (see below), whose sum is σ = 270320742720. Its totient is φ = 45723198464.

The previous prime is 121512533011. The next prime is 121512533041. The reversal of 121512533020 is 20335215121.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 605622 + ... + 780898.

It is an arithmetic number, because the mean of its divisors is an integer number (5631682140).

Almost surely, 2^121512533020 is an apocalyptic number.

121512533020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121512533020 is an abundant number, since it is smaller than the sum of its proper divisors (148808209700).

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

121512533020 is a wasteful number, since it uses less digits than its factorization.

121512533020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177342 (or 177340 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 121512533020 its reverse (20335215121), we get a palindrome (141847748141).

The spelling of 121512533020 in words is "one hundred twenty-one billion, five hundred twelve million, five hundred thirty-three thousand, twenty".