212100022201021 has 8 divisors (see below), whose sum is σ = 213648804139320. Its totient is φ = 210551249054208.

The previous prime is 212100022200973. The next prime is 212100022201033. The reversal of 212100022201021 is 120102220001212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 112960463297796 + 99139558903225 = 10628286^2 + 9956885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212100022201021 - 2³¹ = 212097874717373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100022200986 and 212100022201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100022291021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50894935 + ... + 54904411.

It is an arithmetic number, because the mean of its divisors is an integer number (26706100517415).

Almost surely, 2^{212100022201021} is an apocalyptic number.

It is an amenable number.

212100022201021 is a deficient number, since it is larger than the sum of its proper divisors (1548781938299).

212100022201021 is a wasteful number, since it uses less digits than its factorization.

212100022201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395743.

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

Adding to 212100022201021 its reverse (120102220001212), we get a palindrome (332202242202233).

The spelling of 212100022201021 in words is "two hundred twelve trillion, one hundred billion, twenty-two million, two hundred one thousand, twenty-one".