21438301 has 2 divisors, whose sum is σ = 21438302. Its totient is φ = 21438300.

The previous prime is 21438283. The next prime is 21438331. The reversal of 21438301 is 10383412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20839225 + 599076 = 4565^2 + 774^2 .

It is a cyclic number.

It is not a de Polignac number, because 21438301 - 2¹⁷ = 21307229 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21438331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10719150 + 10719151.

It is an arithmetic number, because the mean of its divisors is an integer number (10719151).

Almost surely, 2^21438301 is an apocalyptic number.

It is an amenable number.

21438301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21438301 is an equidigital number, since it uses as much as digits as its factorization.

21438301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21438301 is about 4630.1512934244. The cubic root of 21438301 is about 277.7986439377.

The spelling of 21438301 in words is "twenty-one million, four hundred thirty-eight thousand, three hundred one".