123401421 has 64 divisors (see below), whose sum is σ = 221921280. Its totient is φ = 66744000.

The previous prime is 123401381. The next prime is 123401423. The reversal of 123401421 is 124104321.

It is not a de Polignac number, because 123401421 - 2¹⁰ = 123400397 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 123401394 and 123401403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123401423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 119176 + ... + 120206.

It is an arithmetic number, because the mean of its divisors is an integer number (3467520).

Almost surely, 2^123401421 is an apocalyptic number.

123401421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123401421 is a deficient number, since it is larger than the sum of its proper divisors (98519859).

123401421 is a wasteful number, since it uses less digits than its factorization.

123401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 123401421 is about 11108.6192211273. The cubic root of 123401421 is about 497.8594101616.

Adding to 123401421 its reverse (124104321), we get a palindrome (247505742).

The spelling of 123401421 in words is "one hundred twenty-three million, four hundred one thousand, four hundred twenty-one".