21652571 has 8 divisors (see below), whose sum is σ = 23278080. Its totient is φ = 20075688.

The previous prime is 21652537. The next prime is 21652639. The reversal of 21652571 is 17525612.

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 21652571 - 2¹⁴ = 21636187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21652171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11231 + ... + 13016.

It is an arithmetic number, because the mean of its divisors is an integer number (2909760).

Almost surely, 2^21652571 is an apocalyptic number.

21652571 is a deficient number, since it is larger than the sum of its proper divisors (1625509).

21652571 is a wasteful number, since it uses less digits than its factorization.

21652571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24313.

The product of its digits is 4200, while the sum is 29.

The square root of 21652571 is about 4653.2323174327. The cubic root of 21652571 is about 278.7210848971.

The spelling of 21652571 in words is "twenty-one million, six hundred fifty-two thousand, five hundred seventy-one".