31231311221201 has 16 divisors (see below), whose sum is σ = 38496865545600. Its totient is φ = 24672991004928.

The previous prime is 31231311221189. The next prime is 31231311221261. The reversal of 31231311221201 is 10212211313213.

It is a happy number.

It is not a de Polignac number, because 31231311221201 - 2⁶ = 31231311221137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31231311221261) 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 15 ways as a sum of consecutive naturals, for example, 260335496 + ... + 260455433.

It is an arithmetic number, because the mean of its divisors is an integer number (2406054096600).

Almost surely, 2^{31231311221201} is an apocalyptic number.

It is an amenable number.

31231311221201 is a deficient number, since it is larger than the sum of its proper divisors (7265554324399).

31231311221201 is a wasteful number, since it uses less digits than its factorization.

31231311221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520791608.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31231311221201 its reverse (10212211313213), we get a palindrome (41443522534414).

The spelling of 31231311221201 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred eleven million, two hundred twenty-one thousand, two hundred one".