123544120021111 has 8 divisors (see below), whose sum is σ = 124638179488704. Its totient is φ = 122450073688320.

The previous prime is 123544120021103. The next prime is 123544120021141. The reversal of 123544120021111 is 111120021445321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123544120021111 - 2³ = 123544120021103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123544120021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123544120021141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16116571 + ... + 22512931.

It is an arithmetic number, because the mean of its divisors is an integer number (15579772436088).

Almost surely, 2^{123544120021111} is an apocalyptic number.

123544120021111 is a deficient number, since it is larger than the sum of its proper divisors (1094059467593).

123544120021111 is a wasteful number, since it uses less digits than its factorization.

123544120021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6567401.

The product of its (nonzero) digits is 1920, while the sum is 28.

Adding to 123544120021111 its reverse (111120021445321), we get a palindrome (234664141466432).

The spelling of 123544120021111 in words is "one hundred twenty-three trillion, five hundred forty-four billion, one hundred twenty million, twenty-one thousand, one hundred eleven".