21060783 has 8 divisors (see below), whose sum is σ = 31201200. Its totient is φ = 14040504.

The previous prime is 21060763. The next prime is 21060829. The reversal of 21060783 is 38706012.

It is not a de Polignac number, because 21060783 - 2⁵ = 21060751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 780029 = 21060783 / (2 + 1 + 0 + 6 + 0 + 7 + 8 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389988 + ... + 390041.

It is an arithmetic number, because the mean of its divisors is an integer number (3900150).

Almost surely, 2^21060783 is an apocalyptic number.

21060783 is a deficient number, since it is larger than the sum of its proper divisors (10140417).

21060783 is an equidigital number, since it uses as much as digits as its factorization.

21060783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780038 (or 780032 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21060783 is about 4589.2028719594. The cubic root of 21060783 is about 276.1583448659.

Adding to 21060783 its reverse (38706012), we get a palindrome (59766795).

The spelling of 21060783 in words is "twenty-one million, sixty thousand, seven hundred eighty-three".