201221312151 has 4 divisors (see below), whose sum is σ = 268295082872. Its totient is φ = 134147541432.

The previous prime is 201221312129. The next prime is 201221312153. The reversal of 201221312151 is 151213122102.

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

It is not a de Polignac number, because 201221312151 - 2²² = 201217117847 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 (201221312153) 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 3 ways as a sum of consecutive naturals, for example, 33536885356 + ... + 33536885361.

It is an arithmetic number, because the mean of its divisors is an integer number (67073770718).

Almost surely, 2^201221312151 is an apocalyptic number.

201221312151 is a deficient number, since it is larger than the sum of its proper divisors (67073770721).

201221312151 is an equidigital number, since it uses as much as digits as its factorization.

201221312151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67073770720.

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

Adding to 201221312151 its reverse (151213122102), we get a palindrome (352434434253).

The spelling of 201221312151 in words is "two hundred one billion, two hundred twenty-one million, three hundred twelve thousand, one hundred fifty-one".