2121321101213 has 8 divisors (see below), whose sum is σ = 2254844407032. Its totient is φ = 1988768874496.

The previous prime is 2121321101201. The next prime is 2121321101227. The reversal of 2121321101213 is 3121011231212.

It can be written as a sum of positive squares in 4 ways, for example, as 1772207925049 + 349113176164 = 1331243^2 + 590858^2 .

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 2121321101213 - 2¹⁸ = 2121320839069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121321109213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242765270 + ... + 242774007.

It is an arithmetic number, because the mean of its divisors is an integer number (281855550879).

Almost surely, 2^{2121321101213} is an apocalyptic number.

It is an amenable number.

2121321101213 is a deficient number, since it is larger than the sum of its proper divisors (133523305819).

2121321101213 is a wasteful number, since it uses less digits than its factorization.

2121321101213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485539551.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2121321101213 its reverse (3121011231212), we get a palindrome (5242332332425).

The spelling of 2121321101213 in words is "two trillion, one hundred twenty-one billion, three hundred twenty-one million, one hundred one thousand, two hundred thirteen".