21829079 has 8 divisors (see below), whose sum is σ = 22413072. Its totient is φ = 21248640.

The previous prime is 21828973. The next prime is 21829091. The reversal of 21829079 is 97092812.

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 21829079 - 2⁸ = 21828823 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 (21829279) 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, 15359 + ... + 16719.

It is an arithmetic number, because the mean of its divisors is an integer number (2801634).

Almost surely, 2^21829079 is an apocalyptic number.

21829079 is a deficient number, since it is larger than the sum of its proper divisors (583993).

21829079 is a wasteful number, since it uses less digits than its factorization.

21829079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 21829079 is about 4672.1599929797. The cubic root of 21829079 is about 279.4763981722.

The spelling of 21829079 in words is "twenty-one million, eight hundred twenty-nine thousand, seventy-nine".