212013122221 has 8 divisors (see below), whose sum is σ = 213250895640. Its totient is φ = 210775490112.

The previous prime is 212013122219. The next prime is 212013122249. The reversal of 212013122221 is 122221310212.

It can be written as a sum of positive squares in 4 ways, for example, as 81804008196 + 130209114025 = 286014^2 + 360845^2 .

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 212013122221 - 2¹ = 212013122219 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 (212013122281) 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, 5376051 + ... + 5415343.

It is an arithmetic number, because the mean of its divisors is an integer number (26656361955).

Almost surely, 2^212013122221 is an apocalyptic number.

It is an amenable number.

212013122221 is a deficient number, since it is larger than the sum of its proper divisors (1237773419).

212013122221 is a wasteful number, since it uses less digits than its factorization.

212013122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70655.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 212013122221 its reverse (122221310212), we get a palindrome (334234432433).

The spelling of 212013122221 in words is "two hundred twelve billion, thirteen million, one hundred twenty-two thousand, two hundred twenty-one".