21120232011 has 16 divisors (see below), whose sum is σ = 29756636160. Its totient is φ = 13297489920.

The previous prime is 21120232009. The next prime is 21120232039. The reversal of 21120232011 is 11023202112.

It is not a de Polignac number, because 21120232011 - 2¹ = 21120232009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120233011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1931830 + ... + 1942731.

It is an arithmetic number, because the mean of its divisors is an integer number (1859789760).

Almost surely, 2^21120232011 is an apocalyptic number.

21120232011 is a deficient number, since it is larger than the sum of its proper divisors (8636404149).

21120232011 is a wasteful number, since it uses less digits than its factorization.

21120232011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874666.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21120232011 its reverse (11023202112), we get a palindrome (32143434123).

The spelling of 21120232011 in words is "twenty-one billion, one hundred twenty million, two hundred thirty-two thousand, eleven".