21011012273 has 2 divisors, whose sum is σ = 21011012274. Its totient is φ = 21011012272.

The previous prime is 21011012177. The next prime is 21011012291. The reversal of 21011012273 is 37221011012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19196933809 + 1814078464 = 138553^2 + 42592^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011012273 - 2²⁴ = 20994235057 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011014273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505506136 + 10505506137.

It is an arithmetic number, because the mean of its divisors is an integer number (10505506137).

Almost surely, 2^21011012273 is an apocalyptic number.

It is an amenable number.

21011012273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011012273 is an equidigital number, since it uses as much as digits as its factorization.

21011012273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21011012273 its reverse (37221011012), we get a palindrome (58232023285).

The spelling of 21011012273 in words is "twenty-one billion, eleven million, twelve thousand, two hundred seventy-three".