21535341440155 has 8 divisors (see below), whose sum is σ = 26733527305200. Its totient is φ = 16634194767456.

The previous prime is 21535341440131. The next prime is 21535341440159. The reversal of 21535341440155 is 55104414353512.

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 21535341440155 - 2²⁵ = 21535307885723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21535341440159) 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, 74259797925 + ... + 74259798214.

It is an arithmetic number, because the mean of its divisors is an integer number (3341690913150).

Almost surely, 2^{21535341440155} is an apocalyptic number.

21535341440155 is a deficient number, since it is larger than the sum of its proper divisors (5198185865045).

21535341440155 is a wasteful number, since it uses less digits than its factorization.

21535341440155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148519596173.

The product of its (nonzero) digits is 720000, while the sum is 43.

Adding to 21535341440155 its reverse (55104414353512), we get a palindrome (76639755793667).

The spelling of 21535341440155 in words is "twenty-one trillion, five hundred thirty-five billion, three hundred forty-one million, four hundred forty thousand, one hundred fifty-five".