21729037215829 has 8 divisors (see below), whose sum is σ = 21901222886400. Its totient is φ = 21556868590656.

The previous prime is 21729037215791. The next prime is 21729037215877. The reversal of 21729037215829 is 92851273092712.

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 21729037215829 - 2³⁷ = 21591598262357 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 (21729037215029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1695604 + ... + 6806845.

It is an arithmetic number, because the mean of its divisors is an integer number (2737652860800).

Almost surely, 2^{21729037215829} is an apocalyptic number.

It is an amenable number.

21729037215829 is a deficient number, since it is larger than the sum of its proper divisors (172185670571).

21729037215829 is a wasteful number, since it uses less digits than its factorization.

21729037215829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8522699.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 21729037215829 in words is "twenty-one trillion, seven hundred twenty-nine billion, thirty-seven million, two hundred fifteen thousand, eight hundred twenty-nine".