21221212096 has 28 divisors (see below), whose sum is σ = 48126678448. Its totient is φ = 9094804992.

The previous prime is 21221212079. The next prime is 21221212109. The reversal of 21221212096 is 69021212212.

It is a tau number, because it is divible by the number of its divisors (28).

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 23683941 + ... + 23684836.

Almost surely, 2^21221212096 is an apocalyptic number.

It is an amenable number.

21221212096 is an abundant number, since it is smaller than the sum of its proper divisors (26905466352).

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

21221212096 is an equidigital number, since it uses as much as digits as its factorization.

21221212096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47368796 (or 47368786 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21221212096 in words is "twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, ninety-six".