123428000521 has 32 divisors (see below), whose sum is σ = 148214062080. Its totient is φ = 100547092800.

The previous prime is 123428000477. The next prime is 123428000587. The reversal of 123428000521 is 125000824321.

It is not a de Polignac number, because 123428000521 - 2¹⁷ = 123427869449 is a prime.

It is a super-2 number, since 2×123428000521² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123428000521.

It is not an unprimeable number, because it can be changed into a prime (123428000021) 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 31 ways as a sum of consecutive naturals, for example, 24628906 + ... + 24633916.

It is an arithmetic number, because the mean of its divisors is an integer number (4631689440).

Almost surely, 2^123428000521 is an apocalyptic number.

It is an amenable number.

123428000521 is a deficient number, since it is larger than the sum of its proper divisors (24786061559).

123428000521 is a wasteful number, since it uses less digits than its factorization.

With its successor (123428000522) it forms an eRAP, since the sums of their prime factors are consecutive (6925 and 6926).

123428000521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 123428000521 its reverse (125000824321), we get a palindrome (248428824842).

The spelling of 123428000521 in words is "one hundred twenty-three billion, four hundred twenty-eight million, five hundred twenty-one", and thus it is an aban number.