123203421 has 12 divisors (see below), whose sum is σ = 194138880. Its totient is φ = 74668680.

The previous prime is 123203417. The next prime is 123203441. The reversal of 123203421 is 124302321.

123203421 is a `hidden beast` number, since 1 + 2 + 320 + 342 + 1 = 666.

It is not a de Polignac number, because 123203421 - 2² = 123203417 is a prime.

It is a super-2 number, since 2×123203421² = 30358165892206482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123203394 and 123203403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123203411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622141 + ... + 622338.

It is an arithmetic number, because the mean of its divisors is an integer number (16178240).

Almost surely, 2^123203421 is an apocalyptic number.

123203421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123203421 is a deficient number, since it is larger than the sum of its proper divisors (70935459).

123203421 is a wasteful number, since it uses less digits than its factorization.

123203421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244496 (or 1244493 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 123203421 is about 11099.7036446925. The cubic root of 123203421 is about 497.5929925576.

Adding to 123203421 its reverse (124302321), we get a palindrome (247505742).

The spelling of 123203421 in words is "one hundred twenty-three million, two hundred three thousand, four hundred twenty-one".