21321013224402 has 192 divisors, whose sum is σ = 52393691750400. Its totient is φ = 6230585940480.

The previous prime is 21321013224391. The next prime is 21321013224409. The reversal of 21321013224402 is 20442231012312.

21321013224402 is a `hidden beast` number, since 2 + 1 + 3 + 21 + 0 + 13 + 224 + 402 = 666.

It is not an unprimeable number, because it can be changed into a prime (21321013224409) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 948305853 + ... + 948328335.

It is an arithmetic number, because the mean of its divisors is an integer number (272883811200).

Almost surely, 2^{21321013224402} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21321013224402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26196845875200).

21321013224402 is an abundant number, since it is smaller than the sum of its proper divisors (31072678525998).

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

21321013224402 is a wasteful number, since it uses less digits than its factorization.

21321013224402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26453 (or 26450 counting only the distinct ones).

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

Adding to 21321013224402 its reverse (20442231012312), we get a palindrome (41763244236714).

The spelling of 21321013224402 in words is "twenty-one trillion, three hundred twenty-one billion, thirteen million, two hundred twenty-four thousand, four hundred two".