21021022219 has 8 divisors (see below), whose sum is σ = 21537673920. Its totient is φ = 20504558400.

The previous prime is 21021022207. The next prime is 21021022279. The reversal of 21021022219 is 91222012012.

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-21021022219 is a prime.

It is a super-2 number, since 2×21021022219² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21021022219.

It is not an unprimeable number, because it can be changed into a prime (21021022279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194622 + ... + 282700.

It is an arithmetic number, because the mean of its divisors is an integer number (2692209240).

Almost surely, 2^21021022219 is an apocalyptic number.

21021022219 is a deficient number, since it is larger than the sum of its proper divisors (516651701).

21021022219 is an equidigital number, since it uses as much as digits as its factorization.

21021022219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93941.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21021022219 in words is "twenty-one billion, twenty-one million, twenty-two thousand, two hundred nineteen".