21034983 has 4 divisors (see below), whose sum is σ = 28046648. Its totient is φ = 14023320.

The previous prime is 21034973. The next prime is 21034997. The reversal of 21034983 is 38943012.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21034983 - 2⁹ = 21034471 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21034983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3505828 + ... + 3505833.

It is an arithmetic number, because the mean of its divisors is an integer number (7011662).

Almost surely, 2^21034983 is an apocalyptic number.

21034983 is a deficient number, since it is larger than the sum of its proper divisors (7011665).

21034983 is an equidigital number, since it uses as much as digits as its factorization.

21034983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011664.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21034983 is about 4586.3910648788. The cubic root of 21034983 is about 276.0455317657.

Adding to 21034983 its reverse (38943012), we get a palindrome (59977995).

The spelling of 21034983 in words is "twenty-one million, thirty-four thousand, nine hundred eighty-three".