21322315 has 8 divisors (see below), whose sum is σ = 29242080. Its totient is φ = 14620992.

The previous prime is 21322307. The next prime is 21322319. The reversal of 21322315 is 51322312.

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 21322315 - 2³ = 21322307 is a prime.

It is a super-2 number, since 2×21322315² = 909282233918450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21322292 and 21322301.

It is not an unprimeable number, because it can be changed into a prime (21322319) 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, 304570 + ... + 304639.

It is an arithmetic number, because the mean of its divisors is an integer number (3655260).

It is a self-describing number.

Almost surely, 2^21322315 is an apocalyptic number.

21322315 is a deficient number, since it is larger than the sum of its proper divisors (7919765).

21322315 is an equidigital number, since it uses as much as digits as its factorization.

21322315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609221.

The product of its digits is 360, while the sum is 19.

The square root of 21322315 is about 4617.6092298938. The cubic root of 21322315 is about 277.2967534823.

Adding to 21322315 its reverse (51322312), we get a palindrome (72644627).

The spelling of 21322315 in words is "twenty-one million, three hundred twenty-two thousand, three hundred fifteen".