212202101 has 4 divisors (see below), whose sum is σ = 217377804. Its totient is φ = 207026400.

The previous prime is 212202091. The next prime is 212202139. The reversal of 212202101 is 101202212.

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 128845201 + 83356900 = 11351^2 + 9130^2 .

It is a cyclic number.

It is not a de Polignac number, because 212202101 - 2¹⁸ = 211939957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212202191) 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, 2587790 + ... + 2587871.

It is an arithmetic number, because the mean of its divisors is an integer number (54344451).

Almost surely, 2^212202101 is an apocalyptic number.

It is an amenable number.

212202101 is a deficient number, since it is larger than the sum of its proper divisors (5175703).

212202101 is an equidigital number, since it uses as much as digits as its factorization.

212202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175702.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 212202101 is about 14567.1583021535. The cubic root of 212202101 is about 596.4626126547.

Adding to 212202101 its reverse (101202212), we get a palindrome (313404313).

The spelling of 212202101 in words is "two hundred twelve million, two hundred two thousand, one hundred one".