21533411412 has 144 divisors (see below), whose sum is σ = 58570220800. Its totient is φ = 6840288000.

The previous prime is 21533411399. The next prime is 21533411423. The reversal of 21533411412 is 21411433512.

21533411412 is a `hidden beast` number, since 2 + 1 + 533 + 4 + 114 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7173912 + ... + 7176912.

Almost surely, 2^21533411412 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 21533411412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29285110400).

21533411412 is an abundant number, since it is smaller than the sum of its proper divisors (37036809388).

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

21533411412 is a wasteful number, since it uses less digits than its factorization.

21533411412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151 (or 3114 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 21533411412 its reverse (21411433512), we get a palindrome (42944844924).

The spelling of 21533411412 in words is "twenty-one billion, five hundred thirty-three million, four hundred eleven thousand, four hundred twelve".