21002220012 has 96 divisors (see below), whose sum is σ = 50439110400. Its totient is φ = 6799721472.

The previous prime is 21002219999. The next prime is 21002220013.

21002220012 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21002220012.

It is not an unprimeable number, because it can be changed into a prime (21002220013) 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 31 ways as a sum of consecutive naturals, for example, 16681039 + ... + 16682297.

It is an arithmetic number, because the mean of its divisors is an integer number (525407400).

Almost surely, 2^21002220012 is an apocalyptic number.

It is an amenable number.

21002220012 is an abundant number, since it is smaller than the sum of its proper divisors (29436890388).

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

21002220012 is a wasteful number, since it uses less digits than its factorization.

21002220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The spelling of 21002220012 in words is "twenty-one billion, two million, two hundred twenty thousand, twelve".