221121320151 has 4 divisors (see below), whose sum is σ = 294828426872. Its totient is φ = 147414213432.

The previous prime is 221121320129. The next prime is 221121320159. The reversal of 221121320151 is 151023121122.

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

It is not a de Polignac number, because 221121320151 - 2¹³ = 221121311959 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 (221121320159) 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, 36853553356 + ... + 36853553361.

It is an arithmetic number, because the mean of its divisors is an integer number (73707106718).

Almost surely, 2^221121320151 is an apocalyptic number.

221121320151 is a deficient number, since it is larger than the sum of its proper divisors (73707106721).

221121320151 is an equidigital number, since it uses as much as digits as its factorization.

221121320151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73707106720.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 221121320151 its reverse (151023121122), we get a palindrome (372144441273).

The spelling of 221121320151 in words is "two hundred twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, one hundred fifty-one".