21485041 has 2 divisors, whose sum is σ = 21485042. Its totient is φ = 21485040.

The previous prime is 21485039. The next prime is 21485047. The reversal of 21485041 is 14058412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 1199025 = 4504^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21485041 - 2¹ = 21485039 is a prime.

Together with 21485039, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21484997 and 21485015.

It is not a weakly prime, because it can be changed into another prime (21485047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742520 + 10742521.

It is an arithmetic number, because the mean of its divisors is an integer number (10742521).

Almost surely, 2^21485041 is an apocalyptic number.

It is an amenable number.

21485041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21485041 is an equidigital number, since it uses as much as digits as its factorization.

21485041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21485041 is about 4635.1958966154. The cubic root of 21485041 is about 278.0003838650. Note that the first 3 decimals are identical.

The spelling of 21485041 in words is "twenty-one million, four hundred eighty-five thousand, forty-one".