31553320324221 has 12 divisors (see below), whose sum is σ = 46028275853820. Its totient is φ = 20827274140800.

The previous prime is 31553320324189. The next prime is 31553320324231. The reversal of 31553320324221 is 12242302335513.

31553320324221 is a `hidden beast` number, since 3 + 1 + 5 + 5 + 3 + 320 + 324 + 2 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20139801332121 + 11413518992100 = 4487739^2 + 3378390^2 .

It is not a de Polignac number, because 31553320324221 - 2⁵ = 31553320324189 is a prime.

It is a super-2 number, since 2×31553320324221² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31553320324231) 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 11 ways as a sum of consecutive naturals, for example, 17356060876 + ... + 17356062693.

It is an arithmetic number, because the mean of its divisors is an integer number (3835689654485).

Almost surely, 2^{31553320324221} is an apocalyptic number.

It is an amenable number.

31553320324221 is a deficient number, since it is larger than the sum of its proper divisors (14474955529599).

31553320324221 is a wasteful number, since it uses less digits than its factorization.

31553320324221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34712123676 (or 34712123673 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 31553320324221 its reverse (12242302335513), we get a palindrome (43795622659734).

The spelling of 31553320324221 in words is "thirty-one trillion, five hundred fifty-three billion, three hundred twenty million, three hundred twenty-four thousand, two hundred twenty-one".