212202100112021 has 4 divisors (see below), whose sum is σ = 212202135434700. Its totient is φ = 212202064789344.

The previous prime is 212202100111999. The next prime is 212202100112047. The reversal of 212202100112021 is 120211001202212.

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 152438161162225 + 59763938949796 = 12346585^2 + 7730714^2 .

It is a cyclic number.

It is not a de Polignac number, because 212202100112021 - 2³⁴ = 212184920242837 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 (212202100112921) 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, 6148376 + ... + 21498993.

It is an arithmetic number, because the mean of its divisors is an integer number (53050533858675).

Almost surely, 2^{212202100112021} is an apocalyptic number.

It is an amenable number.

212202100112021 is a deficient number, since it is larger than the sum of its proper divisors (35322679).

212202100112021 is an equidigital number, since it uses as much as digits as its factorization.

212202100112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35322678.

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

Adding to 212202100112021 its reverse (120211001202212), we get a palindrome (332413101314233).

The spelling of 212202100112021 in words is "two hundred twelve trillion, two hundred two billion, one hundred million, one hundred twelve thousand, twenty-one".