1221031202313 has 16 divisors (see below), whose sum is σ = 1782992111040. Its totient is φ = 738668157504.

The previous prime is 1221031202309. The next prime is 1221031202329. The reversal of 1221031202313 is 3132021301221.

It is not a de Polignac number, because 1221031202313 - 2² = 1221031202309 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221031202313.

It is not an unprimeable number, because it can be changed into a prime (1221031202353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265323906 + ... + 265328507.

It is an arithmetic number, because the mean of its divisors is an integer number (111437006940).

Almost surely, 2^{1221031202313} is an apocalyptic number.

1221031202313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221031202313 is a deficient number, since it is larger than the sum of its proper divisors (561960908727).

1221031202313 is a wasteful number, since it uses less digits than its factorization.

1221031202313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530652488.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1221031202313 its reverse (3132021301221), we get a palindrome (4353052503534).

The spelling of 1221031202313 in words is "one trillion, two hundred twenty-one billion, thirty-one million, two hundred two thousand, three hundred thirteen".