201221252331 has 16 divisors (see below), whose sum is σ = 293003984640. Its totient is φ = 121819554720.

The previous prime is 201221252269. The next prime is 201221252339. The reversal of 201221252331 is 133252122102.

It is not a de Polignac number, because 201221252331 - 2¹⁰ = 201221251307 is a prime.

It is a super-2 number, since 2×201221252331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201221252339) 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, 3287200 + ... + 3347853.

It is an arithmetic number, because the mean of its divisors is an integer number (18312749040).

Almost surely, 2^201221252331 is an apocalyptic number.

201221252331 is a deficient number, since it is larger than the sum of its proper divisors (91782732309).

201221252331 is a wasteful number, since it uses less digits than its factorization.

201221252331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6635986.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 201221252331 its reverse (133252122102), we get a palindrome (334473374433).

The spelling of 201221252331 in words is "two hundred one billion, two hundred twenty-one million, two hundred fifty-two thousand, three hundred thirty-one".