21321201104 has 120 divisors (see below), whose sum is σ = 48398777280. Its totient is φ = 8912830464.

The previous prime is 21321201061. The next prime is 21321201131. The reversal of 21321201104 is 40110212312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82961744 + ... + 82962000.

It is an arithmetic number, because the mean of its divisors is an integer number (403323144).

Almost surely, 2^21321201104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321201104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24199388640).

21321201104 is an abundant number, since it is smaller than the sum of its proper divisors (27077576176).

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

21321201104 is a wasteful number, since it uses less digits than its factorization.

21321201104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21321201104 its reverse (40110212312), we get a palindrome (61431413416).

The spelling of 21321201104 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, one hundred four".