123676487821 has 2 divisors, whose sum is σ = 123676487822. Its totient is φ = 123676487820.

The previous prime is 123676487807. The next prime is 123676487839. The reversal of 123676487821 is 128784676321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106497142921 + 17179344900 = 326339^2 + 131070^2 .

It is a cyclic number.

It is not a de Polignac number, because 123676487821 - 2³⁵ = 89316749453 is a prime.

It is a super-2 number, since 2×123676487821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123676487321) 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 as a sum of consecutive naturals, namely, 61838243910 + 61838243911.

It is an arithmetic number, because the mean of its divisors is an integer number (61838243911).

Almost surely, 2^123676487821 is an apocalyptic number.

It is an amenable number.

123676487821 is a deficient number, since it is larger than the sum of its proper divisors (1).

123676487821 is an equidigital number, since it uses as much as digits as its factorization.

123676487821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5419008, while the sum is 55.

The spelling of 123676487821 in words is "one hundred twenty-three billion, six hundred seventy-six million, four hundred eighty-seven thousand, eight hundred twenty-one".