311012201221 has 2 divisors, whose sum is σ = 311012201222. Its totient is φ = 311012201220.

The previous prime is 311012201209. The next prime is 311012201233. The reversal of 311012201221 is 122102210113.

It is a balanced prime because it is at equal distance from previous prime (311012201209) and next prime (311012201233).

It can be written as a sum of positive squares in only one way, i.e., 307902912100 + 3109289121 = 554890^2 + 55761^2 .

It is a cyclic number.

It is not a de Polignac number, because 311012201221 - 2⁵ = 311012201189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311012201195 and 311012201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311012205221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155506100610 + 155506100611.

It is an arithmetic number, because the mean of its divisors is an integer number (155506100611).

Almost surely, 2^311012201221 is an apocalyptic number.

It is an amenable number.

311012201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311012201221 is an equidigital number, since it uses as much as digits as its factorization.

311012201221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 311012201221 its reverse (122102210113), we get a palindrome (433114411334).

It can be divided in two parts, 31101 and 2201221, that added together give a palindrome (2232322).

The spelling of 311012201221 in words is "three hundred eleven billion, twelve million, two hundred one thousand, two hundred twenty-one".