121145520123 has 12 divisors (see below), whose sum is σ = 175100237520. Its totient is φ = 80711865936.

The previous prime is 121145520107. The next prime is 121145520131. The reversal of 121145520123 is 321025541121.

It is a happy number.

121145520123 is a `hidden beast` number, since 1 + 2 + 1 + 1 + 455 + 201 + 2 + 3 = 666.

It is not a de Polignac number, because 121145520123 - 2⁴ = 121145520107 is a prime.

It is a super-3 number, since 3×121145520123³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (121145520523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4303036 + ... + 4331097.

It is an arithmetic number, because the mean of its divisors is an integer number (14591686460).

Almost surely, 2^121145520123 is an apocalyptic number.

121145520123 is a deficient number, since it is larger than the sum of its proper divisors (53954717397).

121145520123 is a wasteful number, since it uses less digits than its factorization.

121145520123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8635698 (or 8635695 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 121145520123 in words is "one hundred twenty-one billion, one hundred forty-five million, five hundred twenty thousand, one hundred twenty-three".