1213100213221 has 8 divisors (see below), whose sum is σ = 1317976815960. Its totient is φ = 1109875210752.

The previous prime is 1213100213209. The next prime is 1213100213251. The reversal of 1213100213221 is 1223120013121.

It can be written as a sum of positive squares in 4 ways, for example, as 107132490721 + 1105967722500 = 327311^2 + 1051650^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213100213221 - 2¹¹ = 1213100211173 is a prime.

It is a super-2 number, since 2×1213100213221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213100213251) 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 7 ways as a sum of consecutive naturals, for example, 412898536 + ... + 412901473.

It is an arithmetic number, because the mean of its divisors is an integer number (164747101995).

Almost surely, 2^{1213100213221} is an apocalyptic number.

It is an amenable number.

1213100213221 is a deficient number, since it is larger than the sum of its proper divisors (104876602739).

1213100213221 is a wasteful number, since it uses less digits than its factorization.

1213100213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825800135.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1213100213221 its reverse (1223120013121), we get a palindrome (2436220226342).

The spelling of 1213100213221 in words is "one trillion, two hundred thirteen billion, one hundred million, two hundred thirteen thousand, two hundred twenty-one".