24021421 has 2 divisors, whose sum is σ = 24021422. Its totient is φ = 24021420.

The previous prime is 24021397. The next prime is 24021433. The reversal of 24021421 is 12412042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19900521 + 4120900 = 4461^2 + 2030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24021421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 24021395 and 24021404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24021461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12010710 + 12010711.

It is an arithmetic number, because the mean of its divisors is an integer number (12010711).

Almost surely, 2^24021421 is an apocalyptic number.

It is an amenable number.

24021421 is a deficient number, since it is larger than the sum of its proper divisors (1).

24021421 is an equidigital number, since it uses as much as digits as its factorization.

24021421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 24021421 is about 4901.1652696068. The cubic root of 24021421 is about 288.5357063978.

Adding to 24021421 its reverse (12412042), we get a palindrome (36433463).

It can be divided in two parts, 24021 and 421, that added together give a palindrome (24442).

The spelling of 24021421 in words is "twenty-four million, twenty-one thousand, four hundred twenty-one".