21190711 has 2 divisors, whose sum is σ = 21190712. Its totient is φ = 21190710.

The previous prime is 21190703. The next prime is 21190733. The reversal of 21190711 is 11709112.

It is an a-pointer prime, because the next prime (21190733) can be obtained adding 21190711 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21190711 - 2³ = 21190703 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 (21196711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10595355 + 10595356.

It is an arithmetic number, because the mean of its divisors is an integer number (10595356).

Almost surely, 2^21190711 is an apocalyptic number.

21190711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21190711 is an equidigital number, since it uses as much as digits as its factorization.

21190711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 21190711 is about 4603.3369418282. The cubic root of 21190711 is about 276.7250722649.

Adding to 21190711 its reverse (11709112), we get a palindrome (32899823).

The spelling of 21190711 in words is "twenty-one million, one hundred ninety thousand, seven hundred eleven".