21245467 has 2 divisors, whose sum is σ = 21245468. Its totient is φ = 21245466.

The previous prime is 21245459. The next prime is 21245479. The reversal of 21245467 is 76454212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21245467 - 2³ = 21245459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21245407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622733 + 10622734.

It is an arithmetic number, because the mean of its divisors is an integer number (10622734).

Almost surely, 2^21245467 is an apocalyptic number.

21245467 is a deficient number, since it is larger than the sum of its proper divisors (1).

21245467 is an equidigital number, since it uses as much as digits as its factorization.

21245467 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 31.

The square root of 21245467 is about 4609.2805295404. The cubic root of 21245467 is about 276.9632163227.

Adding to 21245467 its reverse (76454212), we get a palindrome (97699679).

It can be divided in two parts, 212454 and 67, that added together give a square (212521 = 461²).

The spelling of 21245467 in words is "twenty-one million, two hundred forty-five thousand, four hundred sixty-seven".