21048487 has 2 divisors, whose sum is σ = 21048488. Its totient is φ = 21048486.

The previous prime is 21048481. The next prime is 21048493. The reversal of 21048487 is 78484012.

It is a balanced prime because it is at equal distance from previous prime (21048481) and next prime (21048493).

It is a cyclic number.

It is not a de Polignac number, because 21048487 - 2³ = 21048479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21048481) 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, 10524243 + 10524244.

It is an arithmetic number, because the mean of its divisors is an integer number (10524244).

Almost surely, 2^21048487 is an apocalyptic number.

21048487 is a deficient number, since it is larger than the sum of its proper divisors (1).

21048487 is an equidigital number, since it uses as much as digits as its factorization.

21048487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 21048487 is about 4587.8630101606. The cubic root of 21048487 is about 276.1045908648.

The spelling of 21048487 in words is "twenty-one million, forty-eight thousand, four hundred eighty-seven".