21438283412 has 72 divisors (see below), whose sum is σ = 47376504000. Its totient is φ = 8480987424.

The previous prime is 21438283369. The next prime is 21438283441.

It is a happy number.

21438283412 is nontrivially palindromic in base 10.

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, 185639 + ... + 278097.

It is an arithmetic number, because the mean of its divisors is an integer number (658007000).

Almost surely, 2^21438283412 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 21438283412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23688252000).

21438283412 is an abundant number, since it is smaller than the sum of its proper divisors (25938220588).

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

21438283412 is a wasteful number, since it uses less digits than its factorization.

21438283412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92510 (or 92481 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The spelling of 21438283412 in words is "twenty-one billion, four hundred thirty-eight million, two hundred eighty-three thousand, four hundred twelve".