21124545311 has 2 divisors, whose sum is σ = 21124545312. Its totient is φ = 21124545310.

The previous prime is 21124545289. The next prime is 21124545329. The reversal of 21124545311 is 11354542112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124545311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21124545361) 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, 10562272655 + 10562272656.

It is an arithmetic number, because the mean of its divisors is an integer number (10562272656).

Almost surely, 2^21124545311 is an apocalyptic number.

21124545311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21124545311 is an equidigital number, since it uses as much as digits as its factorization.

21124545311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

The spelling of 21124545311 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, three hundred eleven".