21100223219 has 2 divisors, whose sum is σ = 21100223220. Its totient is φ = 21100223218.

The previous prime is 21100223203. The next prime is 21100223233. The reversal of 21100223219 is 91232200112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100223219 - 2⁴ = 21100223203 is a prime.

It is a super-2 number, since 2×21100223219² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100223194 and 21100223203.

It is not a weakly prime, because it can be changed into another prime (21100223819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550111609 + 10550111610.

It is an arithmetic number, because the mean of its divisors is an integer number (10550111610).

Almost surely, 2^21100223219 is an apocalyptic number.

21100223219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100223219 is an equidigital number, since it uses as much as digits as its factorization.

21100223219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21100223219 in words is "twenty-one billion, one hundred million, two hundred twenty-three thousand, two hundred nineteen".