21062385 has 24 divisors (see below), whose sum is σ = 37111464. Its totient is φ = 11047680.

The previous prime is 21062383. The next prime is 21062401. The reversal of 21062385 is 58326012.

It can be written as a sum of positive squares in 4 ways, for example, as 159201 + 20903184 = 399^2 + 4572^2 .

It is not a de Polignac number, because 21062385 - 2¹ = 21062383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21062383) 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 in 23 ways as a sum of consecutive naturals, for example, 1092 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (1546311).

Almost surely, 2^21062385 is an apocalyptic number.

It is an amenable number.

21062385 is a deficient number, since it is larger than the sum of its proper divisors (16049079).

21062385 is a wasteful number, since it uses less digits than its factorization.

21062385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745 (or 7742 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21062385 is about 4589.3774087560. The cubic root of 21062385 is about 276.1653467336.

Adding to 21062385 its reverse (58326012), we get a palindrome (79388397).

The spelling of 21062385 in words is "twenty-one million, sixty-two thousand, three hundred eighty-five".