212122203121 has 4 divisors (see below), whose sum is σ = 212139036144. Its totient is φ = 212105370100.

The previous prime is 212122203091. The next prime is 212122203131. The reversal of 212122203121 is 121302221212.

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 212122203121 - 2⁵ = 212122203089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212122203131) 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, 8397595 + ... + 8422816.

It is an arithmetic number, because the mean of its divisors is an integer number (53034759036).

Almost surely, 2^212122203121 is an apocalyptic number.

It is an amenable number.

212122203121 is a deficient number, since it is larger than the sum of its proper divisors (16833023).

212122203121 is a wasteful number, since it uses less digits than its factorization.

212122203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16833022.

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

Adding to 212122203121 its reverse (121302221212), we get a palindrome (333424424333).

The spelling of 212122203121 in words is "two hundred twelve billion, one hundred twenty-two million, two hundred three thousand, one hundred twenty-one".