221421255444691 has 8 divisors (see below), whose sum is σ = 221790972765600. Its totient is φ = 221051542430400.

The previous prime is 221421255444643. The next prime is 221421255444761. The reversal of 221421255444691 is 196444552124122.

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 221421255444691 - 2¹¹ = 221421255442643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221421255244691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111686250 + ... + 113651488.

It is an arithmetic number, because the mean of its divisors is an integer number (27723871595700).

Almost surely, 2^{221421255444691} is an apocalyptic number.

221421255444691 is a deficient number, since it is larger than the sum of its proper divisors (369717320909).

221421255444691 is a wasteful number, since it uses less digits than its factorization.

221421255444691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153309.

The product of its digits is 5529600, while the sum is 52.

The spelling of 221421255444691 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred forty-four thousand, six hundred ninety-one".