21220505219 has 2 divisors, whose sum is σ = 21220505220. Its totient is φ = 21220505218.

The previous prime is 21220505147. The next prime is 21220505239. The reversal of 21220505219 is 91250502212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220505219 is a prime.

It is a super-2 number, since 2×21220505219² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220505191 and 21220505200.

It is not a weakly prime, because it can be changed into another prime (21220505239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610252609 + 10610252610.

It is an arithmetic number, because the mean of its divisors is an integer number (10610252610).

Almost surely, 2^21220505219 is an apocalyptic number.

21220505219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220505219 is an equidigital number, since it uses as much as digits as its factorization.

21220505219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 21220505219 in words is "twenty-one billion, two hundred twenty million, five hundred five thousand, two hundred nineteen".