1213030210121 has 16 divisors (see below), whose sum is σ = 1219005450000. Its totient is φ = 1207073587200.

The previous prime is 1213030210109. The next prime is 1213030210159. The reversal of 1213030210121 is 1210120303121.

It can be written as a sum of positive squares in 8 ways, for example, as 377758096 + 1212652452025 = 19436^2 + 1101205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213030210121 - 2³⁰ = 1211956468297 is a prime.

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 1213030210121.

It is not an unprimeable number, because it can be changed into a prime (1213030210621) 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 15 ways as a sum of consecutive naturals, for example, 398890361 + ... + 398893401.

It is an arithmetic number, because the mean of its divisors is an integer number (76187840625).

Almost surely, 2^{1213030210121} is an apocalyptic number.

It is an amenable number.

1213030210121 is a deficient number, since it is larger than the sum of its proper divisors (5975239879).

1213030210121 is a wasteful number, since it uses less digits than its factorization.

1213030210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1213030210121 its reverse (1210120303121), we get a palindrome (2423150513242).

The spelling of 1213030210121 in words is "one trillion, two hundred thirteen billion, thirty million, two hundred ten thousand, one hundred twenty-one".