21197703 has 8 divisors (see below), whose sum is σ = 28377216. Its totient is φ = 14075000.

The previous prime is 21197699. The next prime is 21197731. The reversal of 21197703 is 30779112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21197703 - 2² = 21197699 is a prime.

It is a super-2 number, since 2×21197703² = 898685224952418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21197773) 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, 13323 + ... + 14828.

It is an arithmetic number, because the mean of its divisors is an integer number (3547152).

Almost surely, 2^21197703 is an apocalyptic number.

21197703 is a deficient number, since it is larger than the sum of its proper divisors (7179513).

21197703 is a wasteful number, since it uses less digits than its factorization.

21197703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28405.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 21197703 is about 4604.0963282712. The cubic root of 21197703 is about 276.7555046076.

The spelling of 21197703 in words is "twenty-one million, one hundred ninety-seven thousand, seven hundred three".