21014783 has 4 divisors (see below), whose sum is σ = 21073680. Its totient is φ = 20955888.

The previous prime is 21014761. The next prime is 21014803. The reversal of 21014783 is 38741012.

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

It is a cyclic number.

It is not a de Polignac number, because 21014783 - 2⁸ = 21014527 is a prime.

It is a super-2 number, since 2×21014783² = 883242209074178, which contains 22 as substring.

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 (21014713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28910 + ... + 29627.

It is an arithmetic number, because the mean of its divisors is an integer number (5268420).

Almost surely, 2^21014783 is an apocalyptic number.

21014783 is a deficient number, since it is larger than the sum of its proper divisors (58897).

21014783 is an equidigital number, since it uses as much as digits as its factorization.

21014783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58896.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21014783 is about 4584.1883687301. The cubic root of 21014783 is about 275.9571408279.

Adding to 21014783 its reverse (38741012), we get a palindrome (59755795).

The spelling of 21014783 in words is "twenty-one million, fourteen thousand, seven hundred eighty-three".