21480587 has 2 divisors, whose sum is σ = 21480588. Its totient is φ = 21480586.

The previous prime is 21480581. The next prime is 21480593. The reversal of 21480587 is 78508412.

It is a balanced prime because it is at equal distance from previous prime (21480581) and next prime (21480593).

It is a cyclic number.

It is not a de Polignac number, because 21480587 - 2⁸ = 21480331 is a prime.

It is a super-2 number, since 2×21480587² = 922831235729138, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21480581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740293 + 10740294.

It is an arithmetic number, because the mean of its divisors is an integer number (10740294).

Almost surely, 2^21480587 is an apocalyptic number.

21480587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480587 is an equidigital number, since it uses as much as digits as its factorization.

21480587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 21480587 is about 4634.7154173692. The cubic root of 21480587 is about 277.9811720596.

Adding to 21480587 its reverse (78508412), we get a palindrome (99988999).

The spelling of 21480587 in words is "twenty-one million, four hundred eighty thousand, five hundred eighty-seven".