21863119 has 2 divisors, whose sum is σ = 21863120. Its totient is φ = 21863118.

The previous prime is 21863081. The next prime is 21863141. The reversal of 21863119 is 91136812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21863119 - 2¹⁹ = 21338831 is a prime.

It is a super-2 number, since 2×21863119² = 955991944816322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21863159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10931559 + 10931560.

It is an arithmetic number, because the mean of its divisors is an integer number (10931560).

Almost surely, 2^21863119 is an apocalyptic number.

21863119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21863119 is an equidigital number, since it uses as much as digits as its factorization.

21863119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 21863119 is about 4675.8014286323. The cubic root of 21863119 is about 279.6215934239.

The spelling of 21863119 in words is "twenty-one million, eight hundred sixty-three thousand, one hundred nineteen".