21031022312011 has 4 divisors (see below), whose sum is σ = 21709442386624. Its totient is φ = 20352602237400.

The previous prime is 21031022311979. The next prime is 21031022312039. The reversal of 21031022312011 is 11021322013012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21031022312011 - 2⁵ = 21031022311979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21031022312011.

It is not an unprimeable number, because it can be changed into a prime (21031022315011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339210037260 + ... + 339210037321.

It is an arithmetic number, because the mean of its divisors is an integer number (5427360596656).

Almost surely, 2^{21031022312011} is an apocalyptic number.

21031022312011 is a deficient number, since it is larger than the sum of its proper divisors (678420074613).

21031022312011 is an equidigital number, since it uses as much as digits as its factorization.

21031022312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678420074612.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21031022312011 its reverse (11021322013012), we get a palindrome (32052344325023).

The spelling of 21031022312011 in words is "twenty-one trillion, thirty-one billion, twenty-two million, three hundred twelve thousand, eleven".