212121121102201 has 4 divisors (see below), whose sum is σ = 212122067311732. Its totient is φ = 212120174892672.

The previous prime is 212121121102159. The next prime is 212121121102213. The reversal of 212121121102201 is 102201121121212.

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 67933283887225 + 144187837214976 = 8242165^2 + 12007824^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121121102201 - 2²¹ = 212121119005049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121121102291) 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, 472768416 + ... + 473216881.

It is an arithmetic number, because the mean of its divisors is an integer number (53030516827933).

Almost surely, 2^{212121121102201} is an apocalyptic number.

It is an amenable number.

212121121102201 is a deficient number, since it is larger than the sum of its proper divisors (946209531).

212121121102201 is an equidigital number, since it uses as much as digits as its factorization.

212121121102201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946209530.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212121121102201 its reverse (102201121121212), we get a palindrome (314322242223413).

The spelling of 212121121102201 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred two thousand, two hundred one".