21936097 has 4 divisors (see below), whose sum is σ = 22182660. Its totient is φ = 21689536.

The previous prime is 21936091. The next prime is 21936113. The reversal of 21936097 is 79063912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3651921 + 18284176 = 1911^2 + 4276^2 .

It is a cyclic number.

It is not a de Polignac number, because 21936097 - 2¹¹ = 21934049 is a prime.

It is a super-3 number, since 3×21936097³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21936091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123148 + ... + 123325.

It is an arithmetic number, because the mean of its divisors is an integer number (5545665).

Almost surely, 2^21936097 is an apocalyptic number.

It is an amenable number.

21936097 is a deficient number, since it is larger than the sum of its proper divisors (246563).

21936097 is an equidigital number, since it uses as much as digits as its factorization.

21936097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246562.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 21936097 is about 4683.5987232042. The cubic root of 21936097 is about 279.9323688698.

The spelling of 21936097 in words is "twenty-one million, nine hundred thirty-six thousand, ninety-seven".