21132311 has 2 divisors, whose sum is σ = 21132312. Its totient is φ = 21132310.

The previous prime is 21132301. The next prime is 21132317. The reversal of 21132311 is 11323112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21132311 - 2²² = 16938007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132317) 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, 10566155 + 10566156.

It is an arithmetic number, because the mean of its divisors is an integer number (10566156).

Almost surely, 2^21132311 is an apocalyptic number.

21132311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132311 is an equidigital number, since it uses as much as digits as its factorization.

21132311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 14.

The square root of 21132311 is about 4596.9893408621. The cubic root of 21132311 is about 276.4706272406.

Adding to 21132311 its reverse (11323112), we get a palindrome (32455423).

It can be divided in two parts, 2 and 1132311, that multiplied together give a palindrome (2264622).

The spelling of 21132311 in words is "twenty-one million, one hundred thirty-two thousand, three hundred eleven".