23821421 has 8 divisors (see below), whose sum is σ = 27004320. Its totient is φ = 20831472.

The previous prime is 23821409. The next prime is 23821463. The reversal of 23821421 is 12412832.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23821421 - 2¹⁴ = 23805037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23821121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47975 + ... + 48468.

It is an arithmetic number, because the mean of its divisors is an integer number (3375540).

Almost surely, 2^23821421 is an apocalyptic number.

It is an amenable number.

23821421 is a deficient number, since it is larger than the sum of its proper divisors (3182899).

23821421 is a wasteful number, since it uses less digits than its factorization.

23821421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96475.

The product of its digits is 768, while the sum is 23.

The square root of 23821421 is about 4880.7193117408. The cubic root of 23821421 is about 287.7327003242.

It can be divided in two parts, 23821 and 421, that added together give a palindrome (24242).

The spelling of 23821421 in words is "twenty-three million, eight hundred twenty-one thousand, four hundred twenty-one".