31321220212229 has 2 divisors, whose sum is σ = 31321220212230. Its totient is φ = 31321220212228.

The previous prime is 31321220212187. The next prime is 31321220212237. The reversal of 31321220212229 is 92221202212313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28548429083329 + 2772791128900 = 5343073^2 + 1665170^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321220212229 - 2¹² = 31321220208133 is a prime.

It is a super-2 number, since 2×31321220212229² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31321220212195 and 31321220212204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321220212829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660610106114 + 15660610106115.

It is an arithmetic number, because the mean of its divisors is an integer number (15660610106115).

Almost surely, 2^{31321220212229} is an apocalyptic number.

It is an amenable number.

31321220212229 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321220212229 is an equidigital number, since it uses as much as digits as its factorization.

31321220212229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 31321220212229 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-nine".