21062939 has 4 divisors (see below), whose sum is σ = 21073656. Its totient is φ = 21052224.

The previous prime is 21062927. The next prime is 21062957. The reversal of 21062939 is 93926012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21062939 - 2⁸ = 21062683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21062959) 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 3 ways as a sum of consecutive naturals, for example, 1469 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (5268414).

Almost surely, 2^21062939 is an apocalyptic number.

21062939 is a deficient number, since it is larger than the sum of its proper divisors (10717).

21062939 is an equidigital number, since it uses as much as digits as its factorization.

21062939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 21062939 is about 4589.4377651298. The cubic root of 21062939 is about 276.1677680210.

The spelling of 21062939 in words is "twenty-one million, sixty-two thousand, nine hundred thirty-nine".