21655212115316 has 24 divisors (see below), whose sum is σ = 40868507796480. Its totient is φ = 9980812413792.

The previous prime is 21655212115289. The next prime is 21655212115331. The reversal of 21655212115316 is 61351121255612.

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, 289563716 + ... + 289638491.

It is an arithmetic number, because the mean of its divisors is an integer number (1702854491520).

Almost surely, 2^{21655212115316} is an apocalyptic number.

21655212115316 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21655212115316 is a deficient number, since it is larger than the sum of its proper divisors (19213295681164).

21655212115316 is a wasteful number, since it uses less digits than its factorization.

21655212115316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579202943 (or 579202941 counting only the distinct ones).

The product of its digits is 108000, while the sum is 41.

The spelling of 21655212115316 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred twelve million, one hundred fifteen thousand, three hundred sixteen".