21438843516830 has 32 divisors (see below), whose sum is σ = 38960895919968. Its totient is φ = 8493212851200.

The previous prime is 21438843516793. The next prime is 21438843516859. The reversal of 21438843516830 is 3861534883412.

It is a super-2 number, since 2×21438843516830² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5688356 + ... + 8673815.

It is an arithmetic number, because the mean of its divisors is an integer number (1217527997499).

Almost surely, 2^{21438843516830} is an apocalyptic number.

21438843516830 is a deficient number, since it is larger than the sum of its proper divisors (17522052403138).

21438843516830 is a wasteful number, since it uses less digits than its factorization.

21438843516830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14363612.

The product of its (nonzero) digits is 13271040, while the sum is 56.

The spelling of 21438843516830 in words is "twenty-one trillion, four hundred thirty-eight billion, eight hundred forty-three million, five hundred sixteen thousand, eight hundred thirty".