221121202221111 has 4 divisors (see below), whose sum is σ = 294828269628152. Its totient is φ = 147414134814072.

The previous prime is 221121202221109. The next prime is 221121202221113. The reversal of 221121202221111 is 111122202121122.

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

It is an interprime number because it is at equal distance from previous prime (221121202221109) and next prime (221121202221113).

It is not a de Polignac number, because 221121202221111 - 2¹ = 221121202221109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121202221113) 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, 36853533703516 + ... + 36853533703521.

It is an arithmetic number, because the mean of its divisors is an integer number (73707067407038).

Almost surely, 2^{221121202221111} is an apocalyptic number.

221121202221111 is a deficient number, since it is larger than the sum of its proper divisors (73707067407041).

221121202221111 is an equidigital number, since it uses as much as digits as its factorization.

221121202221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73707067407040.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221121202221111 its reverse (111122202121122), we get a palindrome (332243404342233).

The spelling of 221121202221111 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred eleven".