21223232212 has 72 divisors (see below), whose sum is σ = 46989096840. Its totient is φ = 8312774400.

The previous prime is 21223232189. The next prime is 21223232269.

21223232212 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 11942992656 + 9280239556 = 109284^2 + 96334^2 .

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, 216114 + ... + 298582.

It is an arithmetic number, because the mean of its divisors is an integer number (652626345).

Almost surely, 2^21223232212 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 21223232212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23494548420).

21223232212 is an abundant number, since it is smaller than the sum of its proper divisors (25765864628).

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

21223232212 is a wasteful number, since it uses less digits than its factorization.

21223232212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82601 (or 82592 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The spelling of 21223232212 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty-two thousand, two hundred twelve".