21124651323 has 32 divisors (see below), whose sum is σ = 30109077504. Its totient is φ = 13142318112.

The previous prime is 21124651297. The next prime is 21124651357. The reversal of 21124651323 is 32315642112.

It is not a de Polignac number, because 21124651323 - 2³⁴ = 3944782139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124641323) 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 in 31 ways as a sum of consecutive naturals, for example, 2912940 + ... + 2920182.

It is an arithmetic number, because the mean of its divisors is an integer number (940908672).

Almost surely, 2^21124651323 is an apocalyptic number.

21124651323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21124651323 is a deficient number, since it is larger than the sum of its proper divisors (8984426181).

21124651323 is a wasteful number, since it uses less digits than its factorization.

21124651323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8295.

The product of its digits is 8640, while the sum is 30.

The spelling of 21124651323 in words is "twenty-one billion, one hundred twenty-four million, six hundred fifty-one thousand, three hundred twenty-three".