21485047 has 2 divisors, whose sum is σ = 21485048. Its totient is φ = 21485046.

The previous prime is 21485041. The next prime is 21485053. The reversal of 21485047 is 74058412.

It is a balanced prime because it is at equal distance from previous prime (21485041) and next prime (21485053).

It is a cyclic number.

It is not a de Polignac number, because 21485047 - 2³ = 21485039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21485041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742523 + 10742524.

It is an arithmetic number, because the mean of its divisors is an integer number (10742524).

Almost surely, 2^21485047 is an apocalyptic number.

21485047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21485047 is an equidigital number, since it uses as much as digits as its factorization.

21485047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 21485047 is about 4635.1965438372. The cubic root of 21485047 is about 278.0004097435. Note that the first 3 decimals are identical.

The spelling of 21485047 in words is "twenty-one million, four hundred eighty-five thousand, forty-seven".