21322115 has 8 divisors (see below), whose sum is σ = 25628400. Its totient is φ = 17029792.

The previous prime is 21322099. The next prime is 21322117. The reversal of 21322115 is 51122312.

It is a happy number.

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 21322115 - 2⁴ = 21322099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21322093 and 21322102.

It is not an unprimeable number, because it can be changed into a prime (21322117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (3203550).

Almost surely, 2^21322115 is an apocalyptic number.

21322115 is a deficient number, since it is larger than the sum of its proper divisors (4306285).

21322115 is an equidigital number, since it uses as much as digits as its factorization.

21322115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6981.

The product of its digits is 120, while the sum is 17.

The square root of 21322115 is about 4617.5875736146. The cubic root of 21322115 is about 277.2958864794.

Adding to 21322115 its reverse (51122312), we get a palindrome (72444427).

The spelling of 21322115 in words is "twenty-one million, three hundred twenty-two thousand, one hundred fifteen".