21596971 has 8 divisors (see below), whose sum is σ = 23595264. Its totient is φ = 19604520.

The previous prime is 21596969. The next prime is 21596983. The reversal of 21596971 is 17969512.

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 21596971 - 2¹ = 21596969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21596921) 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, 10770 + ... + 12616.

It is an arithmetic number, because the mean of its divisors is an integer number (2949408).

Almost surely, 2^21596971 is an apocalyptic number.

21596971 is a deficient number, since it is larger than the sum of its proper divisors (1998293).

21596971 is a wasteful number, since it uses less digits than its factorization.

21596971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921.

The product of its digits is 34020, while the sum is 40.

The square root of 21596971 is about 4647.2541355084. The cubic root of 21596971 is about 278.4823114706.

The spelling of 21596971 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred seventy-one".