121533220240 has 20 divisors (see below), whose sum is σ = 282564737244. Its totient is φ = 48613288064.

The previous prime is 121533220217. The next prime is 121533220241. The reversal of 121533220240 is 42022335121.

It can be written as a sum of positive squares in 2 ways, for example, as 32165705104 + 89367515136 = 179348^2 + 298944^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (121533220241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759582547 + ... + 759582706.

Almost surely, 2^121533220240 is an apocalyptic number.

121533220240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121533220240 is an abundant number, since it is smaller than the sum of its proper divisors (161031517004).

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

121533220240 is a wasteful number, since it uses less digits than its factorization.

121533220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519165266 (or 1519165260 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 121533220240 its reverse (42022335121), we get a palindrome (163555555361).

The spelling of 121533220240 in words is "one hundred twenty-one billion, five hundred thirty-three million, two hundred twenty thousand, two hundred forty".