21302071 has 32 divisors (see below), whose sum is σ = 27675648. Its totient is φ = 15966720.

The previous prime is 21302063. The next prime is 21302081. The reversal of 21302071 is 17020312.

It is a happy number.

It is not a de Polignac number, because 21302071 - 2³ = 21302063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117601 + ... + 117781.

It is an arithmetic number, because the mean of its divisors is an integer number (864864).

Almost surely, 2^21302071 is an apocalyptic number.

21302071 is a deficient number, since it is larger than the sum of its proper divisors (6373577).

21302071 is a wasteful number, since it uses less digits than its factorization.

21302071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21302071 is about 4615.4166659144. The cubic root of 21302071 is about 277.2089679395.

Adding to 21302071 its reverse (17020312), we get a palindrome (38322383).

The spelling of 21302071 in words is "twenty-one million, three hundred two thousand, seventy-one".