212121111101 has 8 divisors (see below), whose sum is σ = 213658102560. Its totient is φ = 210584276208.

The previous prime is 212121111079. The next prime is 212121111107. The reversal of 212121111101 is 101111121212.

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 212121111101 - 2³⁰ = 211047369277 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 (212121111107) 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, 5306150 + ... + 5345976.

It is an arithmetic number, because the mean of its divisors is an integer number (26707262820).

Almost surely, 2^212121111101 is an apocalyptic number.

It is an amenable number.

212121111101 is a deficient number, since it is larger than the sum of its proper divisors (1536991459).

212121111101 is a wasteful number, since it uses less digits than its factorization.

212121111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78283.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 212121111101 its reverse (101111121212), we get a palindrome (313232232313).

It can be divided in two parts, 212121111 and 101, that added together give a palindrome (212121212).

The spelling of 212121111101 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred one".