21713075 has 12 divisors (see below), whose sum is σ = 27001248. Its totient is φ = 17320800.

The previous prime is 21713059. The next prime is 21713099. The reversal of 21713075 is 57031712.

It is not a de Polignac number, because 21713075 - 2⁴ = 21713059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9494 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (2250104).

Almost surely, 2^21713075 is an apocalyptic number.

21713075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21713075 is a deficient number, since it is larger than the sum of its proper divisors (5288173).

21713075 is a wasteful number, since it uses less digits than its factorization.

21713075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2489 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 21713075 is about 4659.7290693773. The cubic root of 21713075 is about 278.9804545173.

Adding to 21713075 its reverse (57031712), we get a palindrome (78744787).

The spelling of 21713075 in words is "twenty-one million, seven hundred thirteen thousand, seventy-five".