21232320312011 has 16 divisors (see below), whose sum is σ = 21747857978880. Its totient is φ = 20717775526560.

The previous prime is 21232320311833. The next prime is 21232320312013. The reversal of 21232320312011 is 11021302323212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232320312011 is a prime.

It is a super-2 number, since 2×21232320312011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232320312013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 909723980 + ... + 909747318.

It is an arithmetic number, because the mean of its divisors is an integer number (1359241123680).

Almost surely, 2^{21232320312011} is an apocalyptic number.

21232320312011 is a deficient number, since it is larger than the sum of its proper divisors (515537666869).

21232320312011 is a wasteful number, since it uses less digits than its factorization.

21232320312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43666.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21232320312011 its reverse (11021302323212), we get a palindrome (32253622635223).

The spelling of 21232320312011 in words is "twenty-one trillion, two hundred thirty-two billion, three hundred twenty million, three hundred twelve thousand, eleven".