23147421 has 40 divisors (see below), whose sum is σ = 37105920. Its totient is φ = 12777600.

The previous prime is 23147413. The next prime is 23147429. The reversal of 23147421 is 12474132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23147413) and next prime (23147429).

It is not a de Polignac number, because 23147421 - 2³ = 23147413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23147391 and 23147400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23147429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 746676 + ... + 746706.

It is an arithmetic number, because the mean of its divisors is an integer number (927648).

Almost surely, 2^23147421 is an apocalyptic number.

It is an amenable number.

23147421 is a deficient number, since it is larger than the sum of its proper divisors (13958499).

23147421 is an equidigital number, since it uses as much as digits as its factorization.

23147421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 62 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 23147421 is about 4811.1766752012. The cubic root of 23147421 is about 284.9930069075.

Subtracting from 23147421 its reverse (12474132), we obtain a square (10673289 = 3267²).

The spelling of 23147421 in words is "twenty-three million, one hundred forty-seven thousand, four hundred twenty-one".