21032011 has 16 divisors (see below), whose sum is σ = 28240128. Its totient is φ = 15127200.

The previous prime is 21032003. The next prime is 21032023. The reversal of 21032011 is 11023012.

It is not a de Polignac number, because 21032011 - 2³ = 21032003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033011) 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 in 15 ways as a sum of consecutive naturals, for example, 9505 + ... + 11506.

It is an arithmetic number, because the mean of its divisors is an integer number (1765008).

Almost surely, 2^21032011 is an apocalyptic number.

21032011 is a deficient number, since it is larger than the sum of its proper divisors (7208117).

21032011 is a wasteful number, since it uses less digits than its factorization.

21032011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21042.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21032011 is about 4586.0670514069. The cubic root of 21032011 is about 276.0325304722.

Adding to 21032011 its reverse (11023012), we get a palindrome (32055023).

It can be divided in two parts, 2103 and 2011, that added together give a palindrome (4114).

The spelling of 21032011 in words is "twenty-one million, thirty-two thousand, eleven".