21032223012 has 72 divisors (see below), whose sum is σ = 54287380056. Its totient is φ = 6864113664.

The previous prime is 21032222999. The next prime is 21032223019.

21032223012 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 9014363136 + 12017859876 = 94944^2 + 109626^2 .

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 (21032223019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 330828 + ... + 389244.

Almost surely, 2^21032223012 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 21032223012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27143690028).

21032223012 is an abundant number, since it is smaller than the sum of its proper divisors (33255157044).

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

21032223012 is a wasteful number, since it uses less digits than its factorization.

21032223012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58637 (or 58632 counting only the distinct ones).

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

The spelling of 21032223012 in words is "twenty-one billion, thirty-two million, two hundred twenty-three thousand, twelve".