21052703 has 12 divisors (see below), whose sum is σ = 25779960. Its totient is φ = 17094672.

The previous prime is 21052687. The next prime is 21052709. The reversal of 21052703 is 30725012.

It is not a de Polignac number, because 21052703 - 2⁴ = 21052687 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052709) 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 11 ways as a sum of consecutive naturals, for example, 10376 + ... + 12237.

It is an arithmetic number, because the mean of its divisors is an integer number (2148330).

Almost surely, 2^21052703 is an apocalyptic number.

21052703 is a deficient number, since it is larger than the sum of its proper divisors (4727257).

21052703 is a wasteful number, since it uses less digits than its factorization.

21052703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22646 (or 22639 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 21052703 is about 4588.3224603334. The cubic root of 21052703 is about 276.1230241651.

Adding to 21052703 its reverse (30725012), we get a palindrome (51777715).

The spelling of 21052703 in words is "twenty-one million, fifty-two thousand, seven hundred three".