21482987 has 2 divisors, whose sum is σ = 21482988. Its totient is φ = 21482986.

The previous prime is 21482963. The next prime is 21482999. The reversal of 21482987 is 78928412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21482987 - 2¹⁰ = 21481963 is a prime.

It is not a weakly prime, because it can be changed into another prime (21482927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10741493 + 10741494.

It is an arithmetic number, because the mean of its divisors is an integer number (10741494).

Almost surely, 2^21482987 is an apocalyptic number.

21482987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21482987 is an equidigital number, since it uses as much as digits as its factorization.

21482987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The square root of 21482987 is about 4634.9743257110. The cubic root of 21482987 is about 277.9915245074.

The spelling of 21482987 in words is "twenty-one million, four hundred eighty-two thousand, nine hundred eighty-seven".