21000122219 has 8 divisors (see below), whose sum is σ = 22237523568. Its totient is φ = 19762954240.

The previous prime is 21000122201. The next prime is 21000122233. The reversal of 21000122219 is 91222100012.

It is a happy number.

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

It is not a de Polignac number, because 21000122219 - 2²⁰ = 20999073643 is a prime.

It is a super-2 number, since 2×21000122219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000122219.

It is not an unprimeable number, because it can be changed into a prime (21000122279) 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, 147764 + ... + 252654.

It is an arithmetic number, because the mean of its divisors is an integer number (2779690446).

Almost surely, 2^21000122219 is an apocalyptic number.

21000122219 is a deficient number, since it is larger than the sum of its proper divisors (1237401349).

21000122219 is a wasteful number, since it uses less digits than its factorization.

21000122219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116685.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21000122219 in words is "twenty-one billion, one hundred twenty-two thousand, two hundred nineteen".