21460213 has 2 divisors, whose sum is σ = 21460214. Its totient is φ = 21460212.

The previous prime is 21460207. The next prime is 21460237. The reversal of 21460213 is 31206412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 3541924 = 4233^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 21460213 - 2⁵ = 21460181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21461213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730106 + 10730107.

It is an arithmetic number, because the mean of its divisors is an integer number (10730107).

Almost surely, 2^21460213 is an apocalyptic number.

It is an amenable number.

21460213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21460213 is an equidigital number, since it uses as much as digits as its factorization.

21460213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21460213 is about 4632.5169184796. The cubic root of 21460213 is about 277.8932573306.

Adding to 21460213 its reverse (31206412), we get a palindrome (52666625).

The spelling of 21460213 in words is "twenty-one million, four hundred sixty thousand, two hundred thirteen".