123421434129 has 80 divisors (see below), whose sum is σ = 213811716096. Its totient is φ = 69495084000.

The previous prime is 123421434127. The next prime is 123421434131. The reversal of 123421434129 is 921434124321.

123421434129 is a `hidden beast` number, since 1 + 23 + 4 + 214 + 3 + 412 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (123421434127) and next prime (123421434131).

It is not a de Polignac number, because 123421434129 - 2¹ = 123421434127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123421434093 and 123421434102.

It is not an unprimeable number, because it can be changed into a prime (123421434127) 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 79 ways as a sum of consecutive naturals, for example, 11582454 + ... + 11593104.

Almost surely, 2^123421434129 is an apocalyptic number.

It is an amenable number.

123421434129 is a deficient number, since it is larger than the sum of its proper divisors (90390281967).

123421434129 is a wasteful number, since it uses less digits than its factorization.

123421434129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968 (or 10959 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 123421434129 in words is "one hundred twenty-three billion, four hundred twenty-one million, four hundred thirty-four thousand, one hundred twenty-nine".