212323020121 has 4 divisors (see below), whose sum is σ = 212324968372. Its totient is φ = 212321071872.

The previous prime is 212323020113. The next prime is 212323020139. The reversal of 212323020121 is 121020323212.

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 128952810000 + 83370210121 = 359100^2 + 288739^2 .

It is a cyclic number.

It is not a de Polignac number, because 212323020121 - 2³ = 212323020113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212323090121) 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, 800316 + ... + 1032061.

It is an arithmetic number, because the mean of its divisors is an integer number (53081242093).

Almost surely, 2^212323020121 is an apocalyptic number.

It is an amenable number.

212323020121 is a deficient number, since it is larger than the sum of its proper divisors (1948251).

212323020121 is a wasteful number, since it uses less digits than its factorization.

212323020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948250.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212323020121 its reverse (121020323212), we get a palindrome (333343343333).

The spelling of 212323020121 in words is "two hundred twelve billion, three hundred twenty-three million, twenty thousand, one hundred twenty-one".