21083463 has 8 divisors (see below), whose sum is σ = 31234800. Its totient is φ = 14055624.

The previous prime is 21083449. The next prime is 21083537. The reversal of 21083463 is 36438012.

It is a happy number.

It is not a de Polignac number, because 21083463 - 2⁵ = 21083431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 780869 = 21083463 / (2 + 1 + 0 + 8 + 3 + 4 + 6 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083443) 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, 390408 + ... + 390461.

It is an arithmetic number, because the mean of its divisors is an integer number (3904350).

Almost surely, 2^21083463 is an apocalyptic number.

21083463 is a deficient number, since it is larger than the sum of its proper divisors (10151337).

21083463 is an equidigital number, since it uses as much as digits as its factorization.

21083463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780878 (or 780872 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21083463 is about 4591.6732244357. The cubic root of 21083463 is about 276.2574393825.

The spelling of 21083463 in words is "twenty-one million, eighty-three thousand, four hundred sixty-three".