21434983 has 8 divisors (see below), whose sum is σ = 22668800. Its totient is φ = 20211768.

The previous prime is 21434957. The next prime is 21435017. The reversal of 21434983 is 38943412.

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 21434983 - 2⁹ = 21434471 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434953) 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, 1708 + ... + 6766.

It is an arithmetic number, because the mean of its divisors is an integer number (2833600).

Almost surely, 2^21434983 is an apocalyptic number.

21434983 is a deficient number, since it is larger than the sum of its proper divisors (1233817).

21434983 is a wasteful number, since it uses less digits than its factorization.

21434983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5301.

The product of its digits is 20736, while the sum is 34.

The square root of 21434983 is about 4629.7929759332. The cubic root of 21434983 is about 277.7843115915.

The spelling of 21434983 in words is "twenty-one million, four hundred thirty-four thousand, nine hundred eighty-three".