21213612366432 has 192 divisors, whose sum is σ = 56914208064000. Its totient is φ = 6916831764480.

The previous prime is 21213612366343. The next prime is 21213612366469. The reversal of 21213612366432 is 23466321631212.

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 31 ways as a sum of consecutive naturals, for example, 651487432 + ... + 651519992.

It is an arithmetic number, because the mean of its divisors is an integer number (296428167000).

Almost surely, 2^{21213612366432} 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 21213612366432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28457104032000).

21213612366432 is an abundant number, since it is smaller than the sum of its proper divisors (35700595697568).

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

21213612366432 is a wasteful number, since it uses less digits than its factorization.

21213612366432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33349 (or 33341 counting only the distinct ones).

The product of its digits is 373248, while the sum is 42.

Adding to 21213612366432 its reverse (23466321631212), we get a palindrome (44679933997644).

The spelling of 21213612366432 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred sixty-six thousand, four hundred thirty-two".