21059318044 has 12 divisors (see below), whose sum is σ = 36855361368. Its totient is φ = 10529214800.

The previous prime is 21059318017. The next prime is 21059318101. The reversal of 21059318044 is 44081395012.

It is a junction number, because it is equal to n+sod(n) for n = 21059317994 and 21059318012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10359 + ... + 205489.

It is an arithmetic number, because the mean of its divisors is an integer number (3071280114).

Almost surely, 2^21059318044 is an apocalyptic number.

It is an amenable number.

21059318044 is a deficient number, since it is larger than the sum of its proper divisors (15796043324).

21059318044 is a wasteful number, since it uses less digits than its factorization.

21059318044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222116 (or 222114 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21059318044 in words is "twenty-one billion, fifty-nine million, three hundred eighteen thousand, forty-four".