21312101011 has 2 divisors, whose sum is σ = 21312101012. Its totient is φ = 21312101010.

The previous prime is 21312100993. The next prime is 21312101033. The reversal of 21312101011 is 11010121312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312101011 - 2¹⁹ = 21311576723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312100982 and 21312101000.

It is not a weakly prime, because it can be changed into another prime (21312101081) 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 as a sum of consecutive naturals, namely, 10656050505 + 10656050506.

It is an arithmetic number, because the mean of its divisors is an integer number (10656050506).

Almost surely, 2^21312101011 is an apocalyptic number.

21312101011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312101011 is an equidigital number, since it uses as much as digits as its factorization.

21312101011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21312101011 its reverse (11010121312), we get a palindrome (32322222323).

The spelling of 21312101011 in words is "twenty-one billion, three hundred twelve million, one hundred one thousand, eleven".