21084829829 has 8 divisors (see below), whose sum is σ = 24098196480. Its totient is φ = 18071775216.

The previous prime is 21084829811. The next prime is 21084829837. The reversal of 21084829829 is 92892848012.

It is a happy number.

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 21084829829 - 2⁸ = 21084829573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21084829429) 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, 91292 + ... + 224730.

It is an arithmetic number, because the mean of its divisors is an integer number (3012274560).

Almost surely, 2^21084829829 is an apocalyptic number.

It is an amenable number.

21084829829 is a deficient number, since it is larger than the sum of its proper divisors (3013366651).

21084829829 is a wasteful number, since it uses less digits than its factorization.

21084829829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156019.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 21084829829 in words is "twenty-one billion, eighty-four million, eight hundred twenty-nine thousand, eight hundred twenty-nine".