121500245045543 has 32 divisors (see below), whose sum is σ = 150632991605376. Its totient is φ = 95431182778368.

The previous prime is 121500245045513. The next prime is 121500245045549. The reversal of 121500245045543 is 345540542005121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121500245045543 - 2¹⁸ = 121500244783399 is a prime.

It is a super-2 number, since 2×121500245045543² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121500245045543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121500245045549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2013146 + ... + 15717927.

It is an arithmetic number, because the mean of its divisors is an integer number (4707280987668).

Almost surely, 2^{121500245045543} is an apocalyptic number.

121500245045543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121500245045543 is a deficient number, since it is larger than the sum of its proper divisors (29132746559833).

121500245045543 is a wasteful number, since it uses less digits than its factorization.

121500245045543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17731643.

The product of its (nonzero) digits is 480000, while the sum is 41.

The spelling of 121500245045543 in words is "one hundred twenty-one trillion, five hundred billion, two hundred forty-five million, forty-five thousand, five hundred forty-three".