21882911 has 2 divisors, whose sum is σ = 21882912. Its totient is φ = 21882910.

The previous prime is 21882899. The next prime is 21882941. The reversal of 21882911 is 11928812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21882911 - 2¹⁴ = 21866527 is a prime.

It is a Sophie Germain prime.

It is equal to p_1382288 and since 21882911 and 1382288 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21882941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10941455 + 10941456.

It is an arithmetic number, because the mean of its divisors is an integer number (10941456).

Almost surely, 2^21882911 is an apocalyptic number.

21882911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21882911 is an equidigital number, since it uses as much as digits as its factorization.

21882911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 32.

The square root of 21882911 is about 4677.9173784923. The cubic root of 21882911 is about 279.7059455454.

The spelling of 21882911 in words is "twenty-one million, eight hundred eighty-two thousand, nine hundred eleven".