21313122011 has 2 divisors, whose sum is σ = 21313122012. Its totient is φ = 21313122010.

The previous prime is 21313121941. The next prime is 21313122119. The reversal of 21313122011 is 11022131312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21313122011 - 2¹⁰ = 21313120987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21313122211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656561005 + 10656561006.

It is an arithmetic number, because the mean of its divisors is an integer number (10656561006).

Almost surely, 2^21313122011 is an apocalyptic number.

21313122011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313122011 is an equidigital number, since it uses as much as digits as its factorization.

21313122011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21313122011 its reverse (11022131312), we get a palindrome (32335253323).

The spelling of 21313122011 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-two thousand, eleven".