21224332043420 has 192 divisors, whose sum is σ = 49332975713280. Its totient is φ = 7606046976000.

The previous prime is 21224332043407. The next prime is 21224332043437. The reversal of 21224332043420 is 2434023342212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4571251619 + ... + 4571256261.

It is an arithmetic number, because the mean of its divisors is an integer number (256942581840).

Almost surely, 2^{21224332043420} is an apocalyptic number.

21224332043420 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 21224332043420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24666487856640).

21224332043420 is an abundant number, since it is smaller than the sum of its proper divisors (28108643669860).

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

21224332043420 is a wasteful number, since it uses less digits than its factorization.

21224332043420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5676 (or 5674 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21224332043420 its reverse (2434023342212), we get a palindrome (23658355385632).

The spelling of 21224332043420 in words is "twenty-one trillion, two hundred twenty-four billion, three hundred thirty-two million, forty-three thousand, four hundred twenty".