21919359 has 16 divisors (see below), whose sum is σ = 36437760. Its totient is φ = 11386560.

The previous prime is 21919357. The next prime is 21919361. The reversal of 21919359 is 95391912.

21919359 = 353² + 354² + ... + 478².

It is an interprime number because it is at equal distance from previous prime (21919357) and next prime (21919361).

It is not a de Polignac number, because 21919359 - 2¹ = 21919357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21919357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47214 + ... + 47675.

It is an arithmetic number, because the mean of its divisors is an integer number (2277360).

Almost surely, 2^21919359 is an apocalyptic number.

21919359 is a deficient number, since it is larger than the sum of its proper divisors (14518401).

21919359 is a wasteful number, since it uses less digits than its factorization.

21919359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94910.

The product of its digits is 21870, while the sum is 39.

The square root of 21919359 is about 4681.8115083801. The cubic root of 21919359 is about 279.8611513961.

The spelling of 21919359 in words is "twenty-one million, nine hundred nineteen thousand, three hundred fifty-nine".