1221313331302 has 4 divisors (see below), whose sum is σ = 1831969996956. Its totient is φ = 610656665650.

The previous prime is 1221313331297. The next prime is 1221313331309. The reversal of 1221313331302 is 2031333131221.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221313331309) 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 as a sum of consecutive naturals, namely, 305328332824 + ... + 305328332827.

It is an arithmetic number, because the mean of its divisors is an integer number (457992499239).

Almost surely, 2^{1221313331302} is an apocalyptic number.

1221313331302 is a deficient number, since it is larger than the sum of its proper divisors (610656665654).

1221313331302 is an equidigital number, since it uses as much as digits as its factorization.

1221313331302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610656665653.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221313331302 its reverse (2031333131221), we get a palindrome (3252646462523).

The spelling of 1221313331302 in words is "one trillion, two hundred twenty-one billion, three hundred thirteen million, three hundred thirty-one thousand, three hundred two".