21155152610255 has 8 divisors (see below), whose sum is σ = 25865167720032. Its totient is φ = 16604799029728.

The previous prime is 21155152610197. The next prime is 21155152610303. The reversal of 21155152610255 is 55201625155112.

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 21155152610255 - 2⁴⁴ = 3562966565839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39915382019 + ... + 39915382548.

It is an arithmetic number, because the mean of its divisors is an integer number (3233145965004).

Almost surely, 2^{21155152610255} is an apocalyptic number.

21155152610255 is a deficient number, since it is larger than the sum of its proper divisors (4710015109777).

21155152610255 is an equidigital number, since it uses as much as digits as its factorization.

21155152610255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79830764625.

The product of its (nonzero) digits is 150000, while the sum is 41.

Adding to 21155152610255 its reverse (55201625155112), we get a palindrome (76356777765367).

The spelling of 21155152610255 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-two million, six hundred ten thousand, two hundred fifty-five".