21022345 has 8 divisors (see below), whose sum is σ = 26323776. Its totient is φ = 16086576.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022345 is 54322012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022345 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91287 + ... + 91516.

It is an arithmetic number, because the mean of its divisors is an integer number (3290472).

Almost surely, 2^21022345 is an apocalyptic number.

It is an amenable number.

21022345 is a deficient number, since it is larger than the sum of its proper divisors (5301431).

21022345 is a wasteful number, since it uses less digits than its factorization.

21022345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182831.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21022345 is about 4585.0130861318. The cubic root of 21022345 is about 275.9902371748.

Adding to 21022345 its reverse (54322012), we get a palindrome (75344357).

The spelling of 21022345 in words is "twenty-one million, twenty-two thousand, three hundred forty-five".