21290219 has 2 divisors, whose sum is σ = 21290220. Its totient is φ = 21290218.

The previous prime is 21290189. The next prime is 21290303. The reversal of 21290219 is 91209212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21290219 - 2¹² = 21286123 is a prime.

It is a super-2 number, since 2×21290219² = 906546850135922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21290119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10645109 + 10645110.

It is an arithmetic number, because the mean of its divisors is an integer number (10645110).

Almost surely, 2^21290219 is an apocalyptic number.

21290219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21290219 is an equidigital number, since it uses as much as digits as its factorization.

21290219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 21290219 is about 4614.1325295227. The cubic root of 21290219 is about 277.1575474274.

The spelling of 21290219 in words is "twenty-one million, two hundred ninety thousand, two hundred nineteen".