19834229821 has 8 divisors (see below), whose sum is σ = 22671159680. Its totient is φ = 16998167088.

The previous prime is 19834229773. The next prime is 19834229843. The reversal of 19834229821 is 12892243891.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-19834229821 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 (19834229221) 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, 167001 + ... + 259918.

It is an arithmetic number, because the mean of its divisors is an integer number (2833894960).

Almost surely, 2^19834229821 is an apocalyptic number.

It is an amenable number.

19834229821 is a deficient number, since it is larger than the sum of its proper divisors (2836929859).

19834229821 is an equidigital number, since it uses as much as digits as its factorization.

19834229821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433563.

The product of its digits is 497664, while the sum is 49.

The spelling of 19834229821 in words is "nineteen billion, eight hundred thirty-four million, two hundred twenty-nine thousand, eight hundred twenty-one".