1210311201221 has 4 divisors (see below), whose sum is σ = 1210454560512. Its totient is φ = 1210167841932.

The previous prime is 1210311201179. The next prime is 1210311201263. The reversal of 1210311201221 is 1221021130121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1210311201179) and next prime (1210311201263).

It is a cyclic number.

It is not a de Polignac number, because 1210311201221 - 2³⁸ = 935433294277 is a prime.

It is a super-4 number, since 4×1210311201221⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1210311201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210311201521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71666981 + ... + 71683866.

It is an arithmetic number, because the mean of its divisors is an integer number (302613640128).

Almost surely, 2^{1210311201221} is an apocalyptic number.

It is an amenable number.

1210311201221 is a deficient number, since it is larger than the sum of its proper divisors (143359291).

1210311201221 is an equidigital number, since it uses as much as digits as its factorization.

1210311201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143359290.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1210311201221 its reverse (1221021130121), we get a palindrome (2431332331342).

The spelling of 1210311201221 in words is "one trillion, two hundred ten billion, three hundred eleven million, two hundred one thousand, two hundred twenty-one".