31221132201 has 24 divisors (see below), whose sum is σ = 51561981120. Its totient is φ = 17832915936.

The previous prime is 31221132197. The next prime is 31221132203. The reversal of 31221132201 is 10223112213.

31221132201 is a `hidden beast` number, since 312 + 21 + 132 + 201 = 666.

It is not a de Polignac number, because 31221132201 - 2² = 31221132197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31221132203) 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 23 ways as a sum of consecutive naturals, for example, 40770 + ... + 253188.

It is an arithmetic number, because the mean of its divisors is an integer number (2148415880).

Almost surely, 2^31221132201 is an apocalyptic number.

It is an amenable number.

31221132201 is a deficient number, since it is larger than the sum of its proper divisors (20340848919).

31221132201 is a wasteful number, since it uses less digits than its factorization.

31221132201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214765 (or 214762 counting only the distinct ones).

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

Adding to 31221132201 its reverse (10223112213), we get a palindrome (41444244414).

The spelling of 31221132201 in words is "thirty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred one".