21470567 has 2 divisors, whose sum is σ = 21470568. Its totient is φ = 21470566.

The previous prime is 21470563. The next prime is 21470591. The reversal of 21470567 is 76507412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21470567 - 2² = 21470563 is a prime.

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

It is equal to p_1357871 and since 21470567 and 1357871 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21470563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735283 + 10735284.

It is an arithmetic number, because the mean of its divisors is an integer number (10735284).

Almost surely, 2^21470567 is an apocalyptic number.

21470567 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470567 is an equidigital number, since it uses as much as digits as its factorization.

21470567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21470567 is about 4633.6343187610. The cubic root of 21470567 is about 277.9379422579.

Adding to 21470567 its reverse (76507412), we get a palindrome (97977979).

The spelling of 21470567 in words is "twenty-one million, four hundred seventy thousand, five hundred sixty-seven".