21104421012 has 36 divisors (see below), whose sum is σ = 53354508480. Its totient is φ = 7033854672.

The previous prime is 21104421011. The next prime is 21104421049. The reversal of 21104421012 is 21012440112.

21104421012 is a `hidden beast` number, since 211 + 0 + 442 + 1 + 0 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104421011) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 261189 + ... + 332307.

It is an arithmetic number, because the mean of its divisors is an integer number (1482069680).

Almost surely, 2^21104421012 is an apocalyptic number.

It is an amenable number.

21104421012 is an abundant number, since it is smaller than the sum of its proper divisors (32250087468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21104421012 is a wasteful number, since it uses less digits than its factorization.

21104421012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79372 (or 79367 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21104421012 its reverse (21012440112), we get a palindrome (42116861124).

The spelling of 21104421012 in words is "twenty-one billion, one hundred four million, four hundred twenty-one thousand, twelve".