123044387821 has 4 divisors (see below), whose sum is σ = 124238993632. Its totient is φ = 121849782012.

The previous prime is 123044387803. The next prime is 123044387827. The reversal of 123044387821 is 128783440321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123044387821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123044387827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 597302751 + ... + 597302956.

It is an arithmetic number, because the mean of its divisors is an integer number (31059748408).

Almost surely, 2^123044387821 is an apocalyptic number.

It is an amenable number.

123044387821 is a deficient number, since it is larger than the sum of its proper divisors (1194605811).

123044387821 is a wasteful number, since it uses less digits than its factorization.

123044387821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194605810.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 123044387821 in words is "one hundred twenty-three billion, forty-four million, three hundred eighty-seven thousand, eight hundred twenty-one".