21335345332028 has 96 divisors (see below), whose sum is σ = 48396180887040. Its totient is φ = 7992069223680.

The previous prime is 21335345332027. The next prime is 21335345332039. The reversal of 21335345332028 is 82023354353312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21335345332028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335345332027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12863483 + ... + 14427053.

It is an arithmetic number, because the mean of its divisors is an integer number (504126884240).

Almost surely, 2^{21335345332028} is an apocalyptic number.

21335345332028 is a gapful number since it is divisible by the number (28) 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 21335345332028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24198090443520).

21335345332028 is an abundant number, since it is smaller than the sum of its proper divisors (27060835555012).

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

21335345332028 is a wasteful number, since it uses less digits than its factorization.

21335345332028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565587 (or 1565585 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 44.

The spelling of 21335345332028 in words is "twenty-one trillion, three hundred thirty-five billion, three hundred forty-five million, three hundred thirty-two thousand, twenty-eight".