21132011 has 2 divisors, whose sum is σ = 21132012. Its totient is φ = 21132010.

The previous prime is 21131989. The next prime is 21132061. The reversal of 21132011 is 11023112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21132011 - 2¹⁰ = 21130987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21131983 and 21132001.

It is not a weakly prime, because it can be changed into another prime (21132061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566005 + 10566006.

It is an arithmetic number, because the mean of its divisors is an integer number (10566006).

Almost surely, 2^21132011 is an apocalyptic number.

21132011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132011 is an equidigital number, since it uses as much as digits as its factorization.

21132011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21132011 is about 4596.9567106946. The cubic root of 21132011 is about 276.4693189505.

Adding to 21132011 its reverse (11023112), we get a palindrome (32155123).

The spelling of 21132011 in words is "twenty-one million, one hundred thirty-two thousand, eleven".