221201021331 has 6 divisors (see below), whose sum is σ = 319512586380. Its totient is φ = 147467347548.

The previous prime is 221201021317. The next prime is 221201021339. The reversal of 221201021331 is 133120102122.

221201021331 is a `hidden beast` number, since 221 + 201 + 0 + 213 + 31 = 666.

221201021331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221201021331 - 2¹⁹ = 221200497043 is a prime.

It is a super-2 number, since 2×221201021331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221201021339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12288945621 + ... + 12288945638.

It is an arithmetic number, because the mean of its divisors is an integer number (53252097730).

Almost surely, 2^221201021331 is an apocalyptic number.

221201021331 is a deficient number, since it is larger than the sum of its proper divisors (98311565049).

221201021331 is a wasteful number, since it uses less digits than its factorization.

221201021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24577891265 (or 24577891262 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 221201021331 its reverse (133120102122), we get a palindrome (354321123453).

The spelling of 221201021331 in words is "two hundred twenty-one billion, two hundred one million, twenty-one thousand, three hundred thirty-one".