221242242091 has 16 divisors (see below), whose sum is σ = 249006917376. Its totient is φ = 195040349856.

The previous prime is 221242242079. The next prime is 221242242161. The reversal of 221242242091 is 190242242122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221242242091 - 2⁵ = 221242242059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221242242191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383125 + ... + 767638.

It is an arithmetic number, because the mean of its divisors is an integer number (15562932336).

Almost surely, 2^221242242091 is an apocalyptic number.

221242242091 is a deficient number, since it is larger than the sum of its proper divisors (27764675285).

221242242091 is a wasteful number, since it uses less digits than its factorization.

221242242091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151442.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 221242242091 its sum of digits (31), we get a palindrome (221242242122).

The spelling of 221242242091 in words is "two hundred twenty-one billion, two hundred forty-two million, two hundred forty-two thousand, ninety-one".