121145142520 has 32 divisors (see below), whose sum is σ = 274722854400. Its totient is φ = 48076495488.

The previous prime is 121145142473. The next prime is 121145142529. The reversal of 121145142520 is 25241541121.

It is a super-3 number, since 3×121145142520³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121145142529) 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, 11918655 + ... + 11928814.

It is an arithmetic number, because the mean of its divisors is an integer number (8585089200).

Almost surely, 2^121145142520 is an apocalyptic number.

121145142520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121145142520 is an abundant number, since it is smaller than the sum of its proper divisors (153577711880).

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

121145142520 is a wasteful number, since it uses less digits than its factorization.

121145142520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23847607 (or 23847603 counting only the distinct ones).

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

Adding to 121145142520 its reverse (25241541121), we get a palindrome (146386683641).

The spelling of 121145142520 in words is "one hundred twenty-one billion, one hundred forty-five million, one hundred forty-two thousand, five hundred twenty".