21052343412 has 144 divisors (see below), whose sum is σ = 55863575040. Its totient is φ = 6676992000.

The previous prime is 21052343407. The next prime is 21052343419. The reversal of 21052343412 is 21434325012.

21052343412 is a `hidden beast` number, since 2 + 10 + 5 + 234 + 3 + 412 = 666.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052343419) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17528412 + ... + 17529612.

Almost surely, 2^21052343412 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 21052343412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27931787520).

21052343412 is an abundant number, since it is smaller than the sum of its proper divisors (34811231628).

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

21052343412 is a wasteful number, since it uses less digits than its factorization.

21052343412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494 (or 1489 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21052343412 its reverse (21434325012), we get a palindrome (42486668424).

The spelling of 21052343412 in words is "twenty-one billion, fifty-two million, three hundred forty-three thousand, four hundred twelve".