21814345 has 32 divisors (see below), whose sum is σ = 31104000. Its totient is φ = 14378496.

The previous prime is 21814343. The next prime is 21814357. The reversal of 21814345 is 54341812.

It is a cyclic number.

It is not a de Polignac number, because 21814345 - 2¹ = 21814343 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21814343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 146331 + ... + 146479.

It is an arithmetic number, because the mean of its divisors is an integer number (972000).

Almost surely, 2^21814345 is an apocalyptic number.

It is an amenable number.

21814345 is a deficient number, since it is larger than the sum of its proper divisors (9289655).

21814345 is a wasteful number, since it uses less digits than its factorization.

21814345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its digits is 3840, while the sum is 28.

The square root of 21814345 is about 4670.5829400622. The cubic root of 21814345 is about 279.4135045115.

The spelling of 21814345 in words is "twenty-one million, eight hundred fourteen thousand, three hundred forty-five".