21311332231121 has 2 divisors, whose sum is σ = 21311332231122. Its totient is φ = 21311332231120.

The previous prime is 21311332231093. The next prime is 21311332231171. The reversal of 21311332231121 is 12113223311312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10748962230721 + 10562370000400 = 3278561^2 + 3249980^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311332231121 - 2¹⁴ = 21311332214737 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311332231171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655666115560 + 10655666115561.

It is an arithmetic number, because the mean of its divisors is an integer number (10655666115561).

Almost surely, 2^{21311332231121} is an apocalyptic number.

It is an amenable number.

21311332231121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311332231121 is an equidigital number, since it uses as much as digits as its factorization.

21311332231121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

Adding to 21311332231121 its reverse (12113223311312), we get a palindrome (33424555542433).

The spelling of 21311332231121 in words is "twenty-one trillion, three hundred eleven billion, three hundred thirty-two million, two hundred thirty-one thousand, one hundred twenty-one".