123543400362121 has 16 divisors (see below), whose sum is σ = 123828700881600. Its totient is φ = 123258363624000.

The previous prime is 123543400362103. The next prime is 123543400362181. The reversal of 123543400362121 is 121263004345321.

It is a cyclic number.

It is not a de Polignac number, because 123543400362121 - 2¹⁹ = 123543399837833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123543400362181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12042435690 + ... + 12042445948.

It is an arithmetic number, because the mean of its divisors is an integer number (7739293805100).

Almost surely, 2^{123543400362121} is an apocalyptic number.

It is an amenable number.

123543400362121 is a deficient number, since it is larger than the sum of its proper divisors (285300519479).

123543400362121 is a wasteful number, since it uses less digits than its factorization.

123543400362121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20520.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 123543400362121 in words is "one hundred twenty-three trillion, five hundred forty-three billion, four hundred million, three hundred sixty-two thousand, one hundred twenty-one".