21655434635315 has 32 divisors (see below), whose sum is σ = 29632606145856. Its totient is φ = 15050551541760.

The previous prime is 21655434635311. The next prime is 21655434635357. The reversal of 21655434635315 is 51353643455612.

It is not a de Polignac number, because 21655434635315 - 2² = 21655434635311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21655434635311) 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, 37585760 + ... + 38157570.

It is an arithmetic number, because the mean of its divisors is an integer number (926018942058).

Almost surely, 2^{21655434635315} is an apocalyptic number.

21655434635315 is a deficient number, since it is larger than the sum of its proper divisors (7977171510541).

21655434635315 is a wasteful number, since it uses less digits than its factorization.

21655434635315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606119.

The product of its digits is 19440000, while the sum is 53.

The spelling of 21655434635315 in words is "twenty-one trillion, six hundred fifty-five billion, four hundred thirty-four million, six hundred thirty-five thousand, three hundred fifteen".