213030212121 has 24 divisors (see below), whose sum is σ = 314248713480. Its totient is φ = 139034016000.

The previous prime is 213030212119. The next prime is 213030212203. The reversal of 213030212121 is 121212030312.

It can be written as a sum of positive squares in 4 ways, for example, as 37355225625 + 175674986496 = 193275^2 + 419136^2 .

It is not a de Polignac number, because 213030212121 - 2¹ = 213030212119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213030212094 and 213030212103.

It is not an unprimeable number, because it can be changed into a prime (213030212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1235710 + ... + 1397511.

It is an arithmetic number, because the mean of its divisors is an integer number (13093696395).

Almost surely, 2^213030212121 is an apocalyptic number.

It is an amenable number.

213030212121 is a deficient number, since it is larger than the sum of its proper divisors (101218501359).

213030212121 is a wasteful number, since it uses less digits than its factorization.

213030212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633417 (or 2633414 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 213030212121 its reverse (121212030312), we get a palindrome (334242242433).

The spelling of 213030212121 in words is "two hundred thirteen billion, thirty million, two hundred twelve thousand, one hundred twenty-one".