212021121013 has 4 divisors (see below), whose sum is σ = 228330438028. Its totient is φ = 195711804000.

The previous prime is 212021121001. The next prime is 212021121047. The reversal of 212021121013 is 310121120212.

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 15162967044 + 196858153969 = 123138^2 + 443687^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021121013 - 2¹⁷ = 212020989941 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 (212021127013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8154658488 + ... + 8154658513.

It is an arithmetic number, because the mean of its divisors is an integer number (57082609507).

Almost surely, 2^212021121013 is an apocalyptic number.

It is an amenable number.

212021121013 is a deficient number, since it is larger than the sum of its proper divisors (16309317015).

212021121013 is a wasteful number, since it uses less digits than its factorization.

212021121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16309317014.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212021121013 its reverse (310121120212), we get a palindrome (522142241225).

The spelling of 212021121013 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, thirteen".