212121112110101 has 4 divisors (see below), whose sum is σ = 212121157552512. Its totient is φ = 212121066667692.

The previous prime is 212121112109909. The next prime is 212121112110181. The reversal of 212121112110101 is 101011211121212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212121112110101 - 2³⁴ = 212103932240917 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 212121112110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121112110181) 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, 14798471 + ... + 25362116.

It is an arithmetic number, because the mean of its divisors is an integer number (53030289388128).

Almost surely, 2^{212121112110101} is an apocalyptic number.

It is an amenable number.

212121112110101 is a deficient number, since it is larger than the sum of its proper divisors (45442411).

212121112110101 is an equidigital number, since it uses as much as digits as its factorization.

212121112110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45442410.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212121112110101 its reverse (101011211121212), we get a palindrome (313132323231313).

The spelling of 212121112110101 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twelve million, one hundred ten thousand, one hundred one".