21652071 has 12 divisors (see below), whose sum is σ = 33583032. Its totient is φ = 12372528.

The previous prime is 21652063. The next prime is 21652121. The reversal of 21652071 is 17025612.

It is not a de Polignac number, because 21652071 - 2³ = 21652063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73500 + ... + 73793.

It is an arithmetic number, because the mean of its divisors is an integer number (2798586).

Almost surely, 2^21652071 is an apocalyptic number.

21652071 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21652071 is a deficient number, since it is larger than the sum of its proper divisors (11930961).

21652071 is a wasteful number, since it uses less digits than its factorization.

21652071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147310 (or 147303 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21652071 is about 4653.1785910279. The cubic root of 21652071 is about 278.7189394765.

Adding to 21652071 its reverse (17025612), we get a palindrome (38677683).

The spelling of 21652071 in words is "twenty-one million, six hundred fifty-two thousand, seventy-one".