212120020210121 has 4 divisors (see below), whose sum is σ = 212654327566212. Its totient is φ = 211585712854032.

The previous prime is 212120020210117. The next prime is 212120020210127. The reversal of 212120020210121 is 121012020021212.

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 122468285438521 + 89651734771600 = 11066539^2 + 9468460^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120020210121 - 2² = 212120020210117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212120020210121.

It is not an unprimeable number, because it can be changed into a prime (212120020210127) 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, 267153677450 + ... + 267153678243.

It is an arithmetic number, because the mean of its divisors is an integer number (53163581891553).

Almost surely, 2^{212120020210121} is an apocalyptic number.

It is an amenable number.

212120020210121 is a deficient number, since it is larger than the sum of its proper divisors (534307356091).

212120020210121 is an equidigital number, since it uses as much as digits as its factorization.

212120020210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534307356090.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212120020210121 its reverse (121012020021212), we get a palindrome (333132040231333).

The spelling of 212120020210121 in words is "two hundred twelve trillion, one hundred twenty billion, twenty million, two hundred ten thousand, one hundred twenty-one".