21903319 has 2 divisors, whose sum is σ = 21903320. Its totient is φ = 21903318.

The previous prime is 21903313. The next prime is 21903341. The reversal of 21903319 is 91330912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21903319 - 2³ = 21903311 is a prime.

It is a super-2 number, since 2×21903319² = 959510766431522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21903311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951659 + 10951660.

It is an arithmetic number, because the mean of its divisors is an integer number (10951660).

Almost surely, 2^21903319 is an apocalyptic number.

21903319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21903319 is an equidigital number, since it uses as much as digits as its factorization.

21903319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 21903319 is about 4680.0981827308. The cubic root of 21903319 is about 279.7928697722.

It can be divided in two parts, 21903 and 319, that added together give a palindrome (22222).

The spelling of 21903319 in words is "twenty-one million, nine hundred three thousand, three hundred nineteen".