21333001443220 has 12 divisors (see below), whose sum is σ = 44799303030804. Its totient is φ = 8533200577280.

The previous prime is 21333001443197. The next prime is 21333001443317. The reversal of 21333001443220 is 2234410033312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9849767972356 + 11483233470864 = 3138434^2 + 3388692^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533325036061 + ... + 533325036100.

It is an arithmetic number, because the mean of its divisors is an integer number (3733275252567).

Almost surely, 2^{21333001443220} is an apocalyptic number.

21333001443220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21333001443220 is an abundant number, since it is smaller than the sum of its proper divisors (23466301587584).

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

21333001443220 is a wasteful number, since it uses less digits than its factorization.

21333001443220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066650072170 (or 1066650072168 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21333001443220 its reverse (2234410033312), we get a palindrome (23567411476532).

The spelling of 21333001443220 in words is "twenty-one trillion, three hundred thirty-three billion, one million, four hundred forty-three thousand, two hundred twenty".