21312110021011 has 2 divisors, whose sum is σ = 21312110021012. Its totient is φ = 21312110021010.

The previous prime is 21312110020987. The next prime is 21312110021029. The reversal of 21312110021011 is 11012001121312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21312110021011 - 2¹¹ = 21312110018963 is a prime.

It is a super-2 number, since 2×21312110021011² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21312110021051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656055010505 + 10656055010506.

It is an arithmetic number, because the mean of its divisors is an integer number (10656055010506).

Almost surely, 2^{21312110021011} is an apocalyptic number.

21312110021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312110021011 is an equidigital number, since it uses as much as digits as its factorization.

21312110021011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21312110021011 its reverse (11012001121312), we get a palindrome (32324111142323).

The spelling of 21312110021011 in words is "twenty-one trillion, three hundred twelve billion, one hundred ten million, twenty-one thousand, eleven".