221821735382855 has 8 divisors (see below), whose sum is σ = 280195876273200. Its totient is φ = 168117525763776.

The previous prime is 221821735382843. The next prime is 221821735382879. The reversal of 221821735382855 is 558283537128122.

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 221821735382855 - 2²⁶ = 221821668273991 is a prime.

It is a super-2 number, since 2×221821735382855² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167482817710 + ... + 1167482817899.

It is an arithmetic number, because the mean of its divisors is an integer number (35024484534150).

Almost surely, 2^{221821735382855} is an apocalyptic number.

221821735382855 is a deficient number, since it is larger than the sum of its proper divisors (58374140890345).

221821735382855 is a wasteful number, since it uses less digits than its factorization.

221821735382855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334965635633.

The product of its digits is 64512000, while the sum is 62.

The spelling of 221821735382855 in words is "two hundred twenty-one trillion, eight hundred twenty-one billion, seven hundred thirty-five million, three hundred eighty-two thousand, eight hundred fifty-five".