21711883 has 2 divisors, whose sum is σ = 21711884. Its totient is φ = 21711882.

The previous prime is 21711857. The next prime is 21711901. The reversal of 21711883 is 38811712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21711883 is a prime.

It is not a weakly prime, because it can be changed into another prime (21711803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855941 + 10855942.

It is an arithmetic number, because the mean of its divisors is an integer number (10855942).

Almost surely, 2^21711883 is an apocalyptic number.

21711883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21711883 is an equidigital number, since it uses as much as digits as its factorization.

21711883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 31.

The square root of 21711883 is about 4659.6011631898. The cubic root of 21711883 is about 278.9753492864.

It can be divided in two parts, 217 and 11883, that added together give a square (12100 = 110²).

The spelling of 21711883 in words is "twenty-one million, seven hundred eleven thousand, eight hundred eighty-three".