123413604021 has 10 divisors (see below), whose sum is σ = 184358593782. Its totient is φ = 82275735960.

The previous prime is 123413604011. The next prime is 123413604037. The reversal of 123413604021 is 120406314321.

It is a happy number.

123413604021 is a `hidden beast` number, since 1 + 2 + 34 + 1 + 3 + 604 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 121752144900 + 1661459121 = 348930^2 + 40761^2 .

It is not a de Polignac number, because 123413604021 - 2¹⁹ = 123413079733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123413604011) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 761812290 + ... + 761812451.

Almost surely, 2^123413604021 is an apocalyptic number.

It is an amenable number.

123413604021 is a deficient number, since it is larger than the sum of its proper divisors (60944989761).

123413604021 is an equidigital number, since it uses as much as digits as its factorization.

123413604021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523624753 (or 1523624744 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 123413604021 its reverse (120406314321), we get a palindrome (243819918342).

The spelling of 123413604021 in words is "one hundred twenty-three billion, four hundred thirteen million, six hundred four thousand, twenty-one".