21401321222120 has 1024 divisors, whose sum is σ = 63541739520000. Its totient is φ = 6313066905600.

The previous prime is 21401321222119. The next prime is 21401321222123. The reversal of 21401321222120 is 2122212310412.

It is not an unprimeable number, because it can be changed into a prime (21401321222123) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 89545276961 + ... + 89545277199.

It is an arithmetic number, because the mean of its divisors is an integer number (62052480000).

Almost surely, 2^{21401321222120} is an apocalyptic number.

21401321222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21401321222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31770869760000).

21401321222120 is an abundant number, since it is smaller than the sum of its proper divisors (42140418297880).

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

21401321222120 is a wasteful number, since it uses less digits than its factorization.

21401321222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21401321222120 its reverse (2122212310412), we get a palindrome (23523533532532).

The spelling of 21401321222120 in words is "twenty-one trillion, four hundred one billion, three hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty".