21210010219 has 4 divisors (see below), whose sum is σ = 21210331144. Its totient is φ = 21209689296.

The previous prime is 21210010207. The next prime is 21210010223. The reversal of 21210010219 is 91201001212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21210010219 - 2⁹ = 21210009707 is a prime.

It is a super-2 number, since 2×21210010219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210010196 and 21210010205.

It is not an unprimeable number, because it can be changed into a prime (21210010519) 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 3 ways as a sum of consecutive naturals, for example, 20817 + ... + 207010.

It is an arithmetic number, because the mean of its divisors is an integer number (5302582786).

Almost surely, 2^21210010219 is an apocalyptic number.

21210010219 is a deficient number, since it is larger than the sum of its proper divisors (320925).

21210010219 is an equidigital number, since it uses as much as digits as its factorization.

21210010219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320924.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 21210010219 in words is "twenty-one billion, two hundred ten million, ten thousand, two hundred nineteen".