21655042333655 has 8 divisors (see below), whose sum is σ = 25986104370000. Its totient is φ = 17323998153856.

The previous prime is 21655042333627. The next prime is 21655042333723. The reversal of 21655042333655 is 55633324055612.

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 21655042333655 - 2³² = 21650747366359 is a prime.

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, 1632905 + ... + 6780594.

It is an arithmetic number, because the mean of its divisors is an integer number (3248263046250).

Almost surely, 2^{21655042333655} is an apocalyptic number.

21655042333655 is a deficient number, since it is larger than the sum of its proper divisors (4331062036345).

21655042333655 is an equidigital number, since it uses as much as digits as its factorization.

21655042333655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8928273.

The product of its (nonzero) digits is 9720000, while the sum is 50.

The spelling of 21655042333655 in words is "twenty-one trillion, six hundred fifty-five billion, forty-two million, three hundred thirty-three thousand, six hundred fifty-five".