221240242091 has 4 divisors (see below), whose sum is σ = 241352991384. Its totient is φ = 201127492800.

The previous prime is 221240242033. The next prime is 221240242099. The reversal of 221240242091 is 190242042122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221240242091 - 2²² = 221236047787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221240242099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10056374630 + ... + 10056374651.

It is an arithmetic number, because the mean of its divisors is an integer number (60338247846).

Almost surely, 2^221240242091 is an apocalyptic number.

221240242091 is a deficient number, since it is larger than the sum of its proper divisors (20112749293).

221240242091 is a wasteful number, since it uses less digits than its factorization.

221240242091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20112749292.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 221240242091 in words is "two hundred twenty-one billion, two hundred forty million, two hundred forty-two thousand, ninety-one".