121145412520 has 32 divisors (see below), whose sum is σ = 297356922720. Its totient is φ = 44052877120.

The previous prime is 121145412511. The next prime is 121145412541. The reversal of 121145412520 is 25214541121.

It is a super-3 number, since 3×121145412520³ (a number of 34 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 137664802 + ... + 137665681.

It is an arithmetic number, because the mean of its divisors is an integer number (9292403835).

Almost surely, 2^121145412520 is an apocalyptic number.

121145412520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121145412520 is an abundant number, since it is smaller than the sum of its proper divisors (176211510200).

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

121145412520 is a wasteful number, since it uses less digits than its factorization.

121145412520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275330505 (or 275330501 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 121145412520 its reverse (25214541121), we get a palindrome (146359953641).

The spelling of 121145412520 in words is "one hundred twenty-one billion, one hundred forty-five million, four hundred twelve thousand, five hundred twenty".