123432421 has 24 divisors (see below), whose sum is σ = 154704384. Its totient is φ = 97907040.

The previous prime is 123432401. The next prime is 123432433. The reversal of 123432421 is 124234321.

It is not a de Polignac number, because 123432421 - 2⁹ = 123431909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123432392 and 123432401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123432401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33171 + ... + 36703.

It is an arithmetic number, because the mean of its divisors is an integer number (6446016).

Almost surely, 2^123432421 is an apocalyptic number.

It is an amenable number.

123432421 is a deficient number, since it is larger than the sum of its proper divisors (31271963).

123432421 is a wasteful number, since it uses less digits than its factorization.

123432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601 (or 3594 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 123432421 is about 11110.0144464353. The cubic root of 123432421 is about 497.9010962010.

Adding to 123432421 its reverse (124234321), we get a palindrome (247666742).

The spelling of 123432421 in words is "one hundred twenty-three million, four hundred thirty-two thousand, four hundred twenty-one".