21332220012 has 18 divisors (see below), whose sum is σ = 53923111788. Its totient is φ = 7110739992.

The previous prime is 21332220011. The next prime is 21332220043. The reversal of 21332220012 is 21002223312.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21332220012² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21332220011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 296280798 + ... + 296280869.

Almost surely, 2^21332220012 is an apocalyptic number.

It is an amenable number.

21332220012 is an abundant number, since it is smaller than the sum of its proper divisors (32590891776).

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

21332220012 is a wasteful number, since it uses less digits than its factorization.

21332220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592561677 (or 592561672 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21332220012 its reverse (21002223312), we get a palindrome (42334443324).

The spelling of 21332220012 in words is "twenty-one billion, three hundred thirty-two million, two hundred twenty thousand, twelve".