21232312011 has 24 divisors (see below), whose sum is σ = 30987347040. Its totient is φ = 14008032000.

The previous prime is 21232312007. The next prime is 21232312037. The reversal of 21232312011 is 11021323212.

21232312011 is a `hidden beast` number, since 212 + 323 + 120 + 11 = 666.

It is not a de Polignac number, because 21232312011 - 2² = 21232312007 is a prime.

It is a super-2 number, since 2×21232312011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21232312001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2532835 + ... + 2541203.

It is an arithmetic number, because the mean of its divisors is an integer number (1291139460).

Almost surely, 2^21232312011 is an apocalyptic number.

21232312011 is a deficient number, since it is larger than the sum of its proper divisors (9755035029).

21232312011 is a wasteful number, since it uses less digits than its factorization.

21232312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267 (or 11264 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21232312011 its reverse (11021323212), we get a palindrome (32253635223).

The spelling of 21232312011 in words is "twenty-one billion, two hundred thirty-two million, three hundred twelve thousand, eleven".