21132611 has 2 divisors, whose sum is σ = 21132612. Its totient is φ = 21132610.

The previous prime is 21132599. The next prime is 21132623. The reversal of 21132611 is 11623112.

It is a balanced prime because it is at equal distance from previous prime (21132599) and next prime (21132623).

It is a cyclic number.

It is not a de Polignac number, because 21132611 - 2¹⁰ = 21131587 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21132611.

It is not a weakly prime, because it can be changed into another prime (21132691) 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, 10566305 + 10566306.

It is an arithmetic number, because the mean of its divisors is an integer number (10566306).

Almost surely, 2^21132611 is an apocalyptic number.

21132611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132611 is an equidigital number, since it uses as much as digits as its factorization.

21132611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 21132611 is about 4597.0219707981. The cubic root of 21132611 is about 276.4719355183.

Adding to 21132611 its reverse (11623112), we get a palindrome (32755723).

The spelling of 21132611 in words is "twenty-one million, one hundred thirty-two thousand, six hundred eleven".