212011112122221 has 4 divisors (see below), whose sum is σ = 282681482829632. Its totient is φ = 141340741414812.

The previous prime is 212011112122217. The next prime is 212011112122253. The reversal of 212011112122221 is 122221211110212.

212011112122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 212011112122221 - 2² = 212011112122217 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 (212011112122261) 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, 35335185353701 + ... + 35335185353706.

It is an arithmetic number, because the mean of its divisors is an integer number (70670370707408).

Almost surely, 2^{212011112122221} is an apocalyptic number.

It is an amenable number.

212011112122221 is a deficient number, since it is larger than the sum of its proper divisors (70670370707411).

212011112122221 is an equidigital number, since it uses as much as digits as its factorization.

212011112122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70670370707410.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212011112122221 its reverse (122221211110212), we get a palindrome (334232323232433).

The spelling of 212011112122221 in words is "two hundred twelve trillion, eleven billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".