21133553035355 has 8 divisors (see below), whose sum is σ = 25360625408352. Its totient is φ = 16906601251008.

The previous prime is 21133553035351. The next prime is 21133553035373. The reversal of 21133553035355 is 55353035533112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21133553035355 - 2² = 21133553035351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133553035351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29761154 + ... + 30462983.

It is an arithmetic number, because the mean of its divisors is an integer number (3170078176044).

Almost surely, 2^{21133553035355} is an apocalyptic number.

21133553035355 is a deficient number, since it is larger than the sum of its proper divisors (4227072372997).

21133553035355 is an equidigital number, since it uses as much as digits as its factorization.

21133553035355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60294325.

The product of its (nonzero) digits is 1518750, while the sum is 44.

Adding to 21133553035355 its reverse (55353035533112), we get a palindrome (76486588568467).

The spelling of 21133553035355 in words is "twenty-one trillion, one hundred thirty-three billion, five hundred fifty-three million, thirty-five thousand, three hundred fifty-five".