212101010212121 has 16 divisors (see below), whose sum is σ = 222504554140800. Its totient is φ = 201905567111808.

The previous prime is 212101010212103. The next prime is 212101010212153. The reversal of 212101010212121 is 121212010101212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212101010212121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212101010212121.

It is not an unprimeable number, because it can be changed into a prime (212101010212321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13321391 + ... + 24528788.

It is an arithmetic number, because the mean of its divisors is an integer number (13906534633800).

Almost surely, 2^{212101010212121} is an apocalyptic number.

It is an amenable number.

212101010212121 is a deficient number, since it is larger than the sum of its proper divisors (10403543928679).

212101010212121 is a wasteful number, since it uses less digits than its factorization.

212101010212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37852928.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212101010212121 its reverse (121212010101212), we get a palindrome (333313020313333).

The spelling of 212101010212121 in words is "two hundred twelve trillion, one hundred one billion, ten million, two hundred twelve thousand, one hundred twenty-one".