21952689 has 8 divisors (see below), whose sum is σ = 31931232. Its totient is φ = 13304640.

The previous prime is 21952673. The next prime is 21952691. The reversal of 21952689 is 98625912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21952689 - 2⁴ = 21952673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21952689.

It is not an unprimeable number, because it can be changed into a prime (21952639) 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, 332584 + ... + 332649.

It is an arithmetic number, because the mean of its divisors is an integer number (3991404).

Almost surely, 2^21952689 is an apocalyptic number.

It is an amenable number.

21952689 is a deficient number, since it is larger than the sum of its proper divisors (9978543).

21952689 is a wasteful number, since it uses less digits than its factorization.

21952689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665247.

The product of its digits is 77760, while the sum is 42.

The square root of 21952689 is about 4685.3696759167. The cubic root of 21952689 is about 280.0029293911.

It can be divided in two parts, 2195 and 2689, that added together give a palindrome (4884).

The spelling of 21952689 in words is "twenty-one million, nine hundred fifty-two thousand, six hundred eighty-nine".