21880319 has 2 divisors, whose sum is σ = 21880320. Its totient is φ = 21880318.

The previous prime is 21880307. The next prime is 21880321. The reversal of 21880319 is 91308812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21880319 - 2⁸ = 21880063 is a prime.

It is a super-2 number, since 2×21880319² = 957496719083522, which contains 22 as substring.

Together with 21880321, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 8 and base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21880379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10940159 + 10940160.

It is an arithmetic number, because the mean of its divisors is an integer number (10940160).

Almost surely, 2^21880319 is an apocalyptic number.

21880319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21880319 is an equidigital number, since it uses as much as digits as its factorization.

21880319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 21880319 is about 4677.6403239240. The cubic root of 21880319 is about 279.6949015176.

The spelling of 21880319 in words is "twenty-one million, eight hundred eighty thousand, three hundred nineteen".