21111383 has 2 divisors, whose sum is σ = 21111384. Its totient is φ = 21111382.

The previous prime is 21111373. The next prime is 21111397. The reversal of 21111383 is 38311112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111383 - 2¹⁴ = 21094999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555691 + 10555692.

It is an arithmetic number, because the mean of its divisors is an integer number (10555692).

Almost surely, 2^21111383 is an apocalyptic number.

21111383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111383 is an equidigital number, since it uses as much as digits as its factorization.

21111383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

The square root of 21111383 is about 4594.7125046079. The cubic root of 21111383 is about 276.3793312098.

Adding to 21111383 its reverse (38311112), we get a palindrome (59422495).

The spelling of 21111383 in words is "twenty-one million, one hundred eleven thousand, three hundred eighty-three".