210121121330213 has 4 divisors (see below), whose sum is σ = 210121377467820. Its totient is φ = 210120865192608.

The previous prime is 210121121330123. The next prime is 210121121330243. The reversal of 210121121330213 is 312033121121012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149595942207364 + 60525179122849 = 12230942^2 + 7779793^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121121330213 - 2¹² = 210121121326117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121121330243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126834320 + ... + 128480297.

It is an arithmetic number, because the mean of its divisors is an integer number (52530344366955).

Almost surely, 2^{210121121330213} is an apocalyptic number.

It is an amenable number.

210121121330213 is a deficient number, since it is larger than the sum of its proper divisors (256137607).

210121121330213 is an equidigital number, since it uses as much as digits as its factorization.

210121121330213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256137606.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 210121121330213 its reverse (312033121121012), we get a palindrome (522154242451225).

The spelling of 210121121330213 in words is "two hundred ten trillion, one hundred twenty-one billion, one hundred twenty-one million, three hundred thirty thousand, two hundred thirteen".