21046679 has 8 divisors (see below), whose sum is σ = 22018560. Its totient is φ = 20079576.

The previous prime is 21046639. The next prime is 21046681. The reversal of 21046679 is 97664012.

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 21046679 - 2¹⁶ = 20981143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10262 + ... + 12140.

It is an arithmetic number, because the mean of its divisors is an integer number (2752320).

Almost surely, 2^21046679 is an apocalyptic number.

21046679 is a deficient number, since it is larger than the sum of its proper divisors (971881).

21046679 is a wasteful number, since it uses less digits than its factorization.

21046679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 21046679 is about 4587.6659643004. The cubic root of 21046679 is about 276.0966851280.

The spelling of 21046679 in words is "twenty-one million, forty-six thousand, six hundred seventy-nine".