21044479 has 2 divisors, whose sum is σ = 21044480. Its totient is φ = 21044478.

The previous prime is 21044477. The next prime is 21044531. The reversal of 21044479 is 97444012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21044479 - 2¹ = 21044477 is a prime.

It is a super-3 number, since 3×21044479³ (a number of 23 digits) contains 333 as substring.

Together with 21044477, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21044479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21044473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522239 + 10522240.

It is an arithmetic number, because the mean of its divisors is an integer number (10522240).

Almost surely, 2^21044479 is an apocalyptic number.

21044479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044479 is an equidigital number, since it uses as much as digits as its factorization.

21044479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21044479 is about 4587.4261846922. The cubic root of 21044479 is about 276.0870647049.

The spelling of 21044479 in words is "twenty-one million, forty-four thousand, four hundred seventy-nine".