21124113405364 has 24 divisors (see below), whose sum is σ = 37360269648576. Its totient is φ = 10450308000000.

The previous prime is 21124113405323. The next prime is 21124113405413. The reversal of 21124113405364 is 46350431142112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 69517117 + ... + 69820324.

It is an arithmetic number, because the mean of its divisors is an integer number (1556677902024).

Almost surely, 2^{21124113405364} is an apocalyptic number.

It is an amenable number.

21124113405364 is a deficient number, since it is larger than the sum of its proper divisors (16236156243212).

21124113405364 is a wasteful number, since it uses less digits than its factorization.

21124113405364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139337847 (or 139337845 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21124113405364 its reverse (46350431142112), we get a palindrome (67474544547476).

The spelling of 21124113405364 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred thirteen million, four hundred five thousand, three hundred sixty-four".