213121034221 has 4 divisors (see below), whose sum is σ = 216733255200. Its totient is φ = 209508813244.

The previous prime is 213121034209. The next prime is 213121034227. The reversal of 213121034221 is 122430121312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213121034221 - 2¹³ = 213121026029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213121034192 and 213121034201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213121034227) 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, 1806110401 + ... + 1806110518.

It is an arithmetic number, because the mean of its divisors is an integer number (54183313800).

Almost surely, 2^213121034221 is an apocalyptic number.

It is an amenable number.

213121034221 is a deficient number, since it is larger than the sum of its proper divisors (3612220979).

213121034221 is an equidigital number, since it uses as much as digits as its factorization.

213121034221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612220978.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 213121034221 its reverse (122430121312), we get a palindrome (335551155533).

The spelling of 213121034221 in words is "two hundred thirteen billion, one hundred twenty-one million, thirty-four thousand, two hundred twenty-one".