21322019 has 2 divisors, whose sum is σ = 21322020. Its totient is φ = 21322018.

The previous prime is 21322003. The next prime is 21322031. The reversal of 21322019 is 91022312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21322019 - 2⁴ = 21322003 is a prime.

It is a super-2 number, since 2×21322019² = 909256988472722, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21322099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661009 + 10661010.

It is an arithmetic number, because the mean of its divisors is an integer number (10661010).

Almost surely, 2^21322019 is an apocalyptic number.

21322019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322019 is an equidigital number, since it uses as much as digits as its factorization.

21322019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21322019 is about 4617.5771785645. The cubic root of 21322019 is about 277.2954703161.

The spelling of 21322019 in words is "twenty-one million, three hundred twenty-two thousand, nineteen".