21443413212 has 72 divisors (see below), whose sum is σ = 58442477184. Its totient is φ = 6590203776.

The previous prime is 21443413193. The next prime is 21443413223. The reversal of 21443413212 is 21231434412.

21443413212 is a `hidden beast` number, since 2 + 1 + 4 + 434 + 13 + 212 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 377338 + ... + 430430.

It is an arithmetic number, because the mean of its divisors is an integer number (811701072).

Almost surely, 2^21443413212 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 21443413212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29221238592).

21443413212 is an abundant number, since it is smaller than the sum of its proper divisors (36999063972).

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

21443413212 is a wasteful number, since it uses less digits than its factorization.

21443413212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53979 (or 53974 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21443413212 its reverse (21231434412), we get a palindrome (42674847624).

The spelling of 21443413212 in words is "twenty-one billion, four hundred forty-three million, four hundred thirteen thousand, two hundred twelve".