21155153031135 has 12 divisors (see below), whose sum is σ = 36668931920712. Its totient is φ = 11282748283248.

The previous prime is 21155153031053. The next prime is 21155153031139. The reversal of 21155153031135 is 53113035155112.

21155153031135 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 5 + 1 + 530 + 3 + 113 + 5 = 666.

It is not a de Polignac number, because 21155153031135 - 2¹⁰ = 21155153030111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21155153031135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21155153031139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235057255857 + ... + 235057255946.

It is an arithmetic number, because the mean of its divisors is an integer number (3055744326726).

Almost surely, 2^{21155153031135} is an apocalyptic number.

21155153031135 is a deficient number, since it is larger than the sum of its proper divisors (15513778889577).

21155153031135 is a wasteful number, since it uses less digits than its factorization.

21155153031135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470114511814 (or 470114511811 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

Adding to 21155153031135 its reverse (53113035155112), we get a palindrome (74268188186247).

The spelling of 21155153031135 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-three million, thirty-one thousand, one hundred thirty-five".