23321421 has 6 divisors (see below), whose sum is σ = 33686510. Its totient is φ = 15547608.

The previous prime is 23321413. The next prime is 23321443. The reversal of 23321421 is 12412332.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 7209225 = 4014^2 + 2685^2 .

It is not a de Polignac number, because 23321421 - 2³ = 23321413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23321394 and 23321403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23321491) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1295626 + ... + 1295643.

It is a self-describing number.

Almost surely, 2^23321421 is an apocalyptic number.

It is an amenable number.

23321421 is a deficient number, since it is larger than the sum of its proper divisors (10365089).

23321421 is a wasteful number, since it uses less digits than its factorization.

23321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591275 (or 2591272 counting only the distinct ones).

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

The square root of 23321421 is about 4829.2257143356. The cubic root of 23321421 is about 285.7053259452.

Adding to 23321421 its reverse (12412332), we get a palindrome (35733753).

The spelling of 23321421 in words is "twenty-three million, three hundred twenty-one thousand, four hundred twenty-one".