221206701308155 has 16 divisors (see below), whose sum is σ = 272715454154880. Its totient is φ = 172123687435392.

The previous prime is 221206701308149. The next prime is 221206701308167. The reversal of 221206701308155 is 551803107602122.

It is a cyclic number.

It is not a de Polignac number, because 221206701308155 - 2²³ = 221206692919547 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203714040 + ... + 204797029.

It is an arithmetic number, because the mean of its divisors is an integer number (17044715884680).

Almost surely, 2^{221206701308155} is an apocalyptic number.

221206701308155 is a deficient number, since it is larger than the sum of its proper divisors (51508752846725).

221206701308155 is a wasteful number, since it uses less digits than its factorization.

221206701308155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408514038.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 221206701308155 in words is "two hundred twenty-one trillion, two hundred six billion, seven hundred one million, three hundred eight thousand, one hundred fifty-five".