21033220012 has 108 divisors (see below), whose sum is σ = 45640891800. Its totient is φ = 8454856704.

The previous prime is 21033220009. The next prime is 21033220051. The reversal of 21033220012 is 21002233012.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 25432743 + ... + 25433569.

It is an arithmetic number, because the mean of its divisors is an integer number (422600850).

Almost surely, 2^21033220012 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 21033220012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22820445900).

21033220012 is an abundant number, since it is smaller than the sum of its proper divisors (24607671788).

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

21033220012 is a wasteful number, since it uses less digits than its factorization.

21033220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1302 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21033220012 its reverse (21002233012), we get a palindrome (42035453024).

The spelling of 21033220012 in words is "twenty-one billion, thirty-three million, two hundred twenty thousand, twelve".