212122202101 has 4 divisors (see below), whose sum is σ = 212133345100. Its totient is φ = 212111059104.

The previous prime is 212122202053. The next prime is 212122202129. The reversal of 212122202101 is 101202221212.

It is a happy number.

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 186200880100 + 25921322001 = 431510^2 + 161001^2 .

It is a cyclic number.

It is not a de Polignac number, because 212122202101 - 2⁹ = 212122201589 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 (212122202161) 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, 5542896 + ... + 5581033.

It is an arithmetic number, because the mean of its divisors is an integer number (53033336275).

Almost surely, 2^212122202101 is an apocalyptic number.

It is an amenable number.

212122202101 is a deficient number, since it is larger than the sum of its proper divisors (11142999).

212122202101 is a wasteful number, since it uses less digits than its factorization.

212122202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11142998.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212122202101 its reverse (101202221212), we get a palindrome (313324423313).

The spelling of 212122202101 in words is "two hundred twelve billion, one hundred twenty-two million, two hundred two thousand, one hundred one".