21701073 has 4 divisors (see below), whose sum is σ = 28934768. Its totient is φ = 14467380.

The previous prime is 21701051. The next prime is 21701083. The reversal of 21701073 is 37010712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21701073 - 2⁵ = 21701041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21701003) 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, 3616843 + ... + 3616848.

It is an arithmetic number, because the mean of its divisors is an integer number (7233692).

Almost surely, 2^21701073 is an apocalyptic number.

It is an amenable number.

21701073 is a deficient number, since it is larger than the sum of its proper divisors (7233695).

21701073 is an equidigital number, since it uses as much as digits as its factorization.

21701073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7233694.

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 21701073 is about 4658.4410482478. The cubic root of 21701073 is about 278.9290424758.

Adding to 21701073 its reverse (37010712), we get a palindrome (58711785).

The spelling of 21701073 in words is "twenty-one million, seven hundred one thousand, seventy-three".