21023775829 has 8 divisors (see below), whose sum is σ = 24274875968. Its totient is φ = 17834601600.

The previous prime is 21023775803. The next prime is 21023775859. The reversal of 21023775829 is 92857732012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21023775829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023775859) 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, 15480747 + ... + 15482104.

It is an arithmetic number, because the mean of its divisors is an integer number (3034359496).

Almost surely, 2^21023775829 is an apocalyptic number.

It is an amenable number.

21023775829 is a deficient number, since it is larger than the sum of its proper divisors (3251100139).

21023775829 is an equidigital number, since it uses as much as digits as its factorization.

21023775829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30962955.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 21023775829 in words is "twenty-one billion, twenty-three million, seven hundred seventy-five thousand, eight hundred twenty-nine".