21970503 has 6 divisors (see below), whose sum is σ = 31735184. Its totient is φ = 14646996.

The previous prime is 21970499. The next prime is 21970513. The reversal of 21970503 is 30507912.

It is not a de Polignac number, because 21970503 - 2² = 21970499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21970513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1220575 + ... + 1220592.

Almost surely, 2^21970503 is an apocalyptic number.

21970503 is a deficient number, since it is larger than the sum of its proper divisors (9764681).

21970503 is a wasteful number, since it uses less digits than its factorization.

21970503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441173 (or 2441170 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 21970503 is about 4687.2703143727. The cubic root of 21970503 is about 280.0786471250.

The spelling of 21970503 in words is "twenty-one million, nine hundred seventy thousand, five hundred three".