21011320229 has 2 divisors, whose sum is σ = 21011320230. Its totient is φ = 21011320228.

The previous prime is 21011320219. The next prime is 21011320243. The reversal of 21011320229 is 92202311012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20078323204 + 932997025 = 141698^2 + 30545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011320229 is a prime.

It is a super-2 number, since 2×21011320229² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011320219) 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, 10505660114 + 10505660115.

It is an arithmetic number, because the mean of its divisors is an integer number (10505660115).

Almost surely, 2^21011320229 is an apocalyptic number.

It is an amenable number.

21011320229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011320229 is an equidigital number, since it uses as much as digits as its factorization.

21011320229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21011320229 in words is "twenty-one billion, eleven million, three hundred twenty thousand, two hundred twenty-nine".