31232202021221 has 8 divisors (see below), whose sum is σ = 31325625987864. Its totient is φ = 31138782474240.

The previous prime is 31232202021193. The next prime is 31232202021271. The reversal of 31232202021221 is 12212020223213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 417335380225 + 30814866640996 = 646015^2 + 5551114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31232202021221 - 2⁶ = 31232202021157 is a prime.

It is a super-2 number, since 2×31232202021221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31232202021271) 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 7 ways as a sum of consecutive naturals, for example, 13331141 + ... + 15497861.

It is an arithmetic number, because the mean of its divisors is an integer number (3915703248483).

Almost surely, 2^{31232202021221} is an apocalyptic number.

It is an amenable number.

31232202021221 is a deficient number, since it is larger than the sum of its proper divisors (93423966643).

31232202021221 is a wasteful number, since it uses less digits than its factorization.

31232202021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209831.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31232202021221 its reverse (12212020223213), we get a palindrome (43444222244434).

The spelling of 31232202021221 in words is "thirty-one trillion, two hundred thirty-two billion, two hundred two million, twenty-one thousand, two hundred twenty-one".