21622219 has 2 divisors, whose sum is σ = 21622220. Its totient is φ = 21622218.

The previous prime is 21622213. The next prime is 21622241. The reversal of 21622219 is 91222612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21622219 is a prime.

It is a super-2 number, since 2×21622219² = 935040708967922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21622193 and 21622202.

It is not a weakly prime, because it can be changed into another prime (21622213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811109 + 10811110.

It is an arithmetic number, because the mean of its divisors is an integer number (10811110).

Almost surely, 2^21622219 is an apocalyptic number.

21622219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21622219 is an equidigital number, since it uses as much as digits as its factorization.

21622219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 21622219 is about 4649.9697848481. The cubic root of 21622219 is about 278.5907893873.

The spelling of 21622219 in words is "twenty-one million, six hundred twenty-two thousand, two hundred nineteen".