1212031320213 has 128 divisors (see below), whose sum is σ = 1983198330880. Its totient is φ = 643785615360.

The previous prime is 1212031320209. The next prime is 1212031320271. The reversal of 1212031320213 is 3120231302121.

It is not a de Polignac number, because 1212031320213 - 2² = 1212031320209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 1212031320213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212031322213) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1133798643 + ... + 1133799711.

It is an arithmetic number, because the mean of its divisors is an integer number (15493736960).

Almost surely, 2^{1212031320213} is an apocalyptic number.

It is an amenable number.

1212031320213 is a deficient number, since it is larger than the sum of its proper divisors (771167010667).

1212031320213 is a wasteful number, since it uses less digits than its factorization.

1212031320213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707.

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

Adding to 1212031320213 its reverse (3120231302121), we get a palindrome (4332262622334).

The spelling of 1212031320213 in words is "one trillion, two hundred twelve billion, thirty-one million, three hundred twenty thousand, two hundred thirteen".