21836697 has 8 divisors (see below), whose sum is σ = 29902656. Its totient is φ = 14164272.

The previous prime is 21836671. The next prime is 21836699. The reversal of 21836697 is 79663812.

It is a happy number.

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

It is not a de Polignac number, because 21836697 - 2⁷ = 21836569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21836699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98253 + ... + 98474.

It is an arithmetic number, because the mean of its divisors is an integer number (3737832).

Almost surely, 2^21836697 is an apocalyptic number.

It is an amenable number.

21836697 is a deficient number, since it is larger than the sum of its proper divisors (8065959).

21836697 is a wasteful number, since it uses less digits than its factorization.

21836697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196767.

The product of its digits is 108864, while the sum is 42.

The square root of 21836697 is about 4672.9751764802. The cubic root of 21836697 is about 279.5089053244.

The spelling of 21836697 in words is "twenty-one million, eight hundred thirty-six thousand, six hundred ninety-seven".