21936165 has 24 divisors (see below), whose sum is σ = 37051488. Its totient is φ = 11080800.

The previous prime is 21936163. The next prime is 21936191. The reversal of 21936165 is 56163912.

It is a happy number.

It is not a de Polignac number, because 21936165 - 2¹ = 21936163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3390 + ... + 7440.

It is an arithmetic number, because the mean of its divisors is an integer number (1543812).

Almost surely, 2^21936165 is an apocalyptic number.

It is an amenable number.

21936165 is a deficient number, since it is larger than the sum of its proper divisors (15115323).

21936165 is a wasteful number, since it uses less digits than its factorization.

21936165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097 (or 4078 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 21936165 is about 4683.6059825737. The cubic root of 21936165 is about 279.9326581249.

The spelling of 21936165 in words is "twenty-one million, nine hundred thirty-six thousand, one hundred sixty-five".