121535452520 has 32 divisors (see below), whose sum is σ = 280845441000. Its totient is φ = 47300283648.

The previous prime is 121535452513. The next prime is 121535452523. The reversal of 121535452520 is 25254535121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 92719032004 + 28816420516 = 304498^2 + 169754^2 .

It is not an unprimeable number, because it can be changed into a prime (121535452523) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41057795 + ... + 41060754.

Almost surely, 2^121535452520 is an apocalyptic number.

121535452520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121535452520 is an abundant number, since it is smaller than the sum of its proper divisors (159309988480).

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

121535452520 is a wasteful number, since it uses less digits than its factorization.

121535452520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82118597 (or 82118593 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 121535452520 its reverse (25254535121), we get a palindrome (146789987641).

The spelling of 121535452520 in words is "one hundred twenty-one billion, five hundred thirty-five million, four hundred fifty-two thousand, five hundred twenty".