212121310221111 has 8 divisors (see below), whose sum is σ = 292581117546480. Its totient is φ = 136537854854912.

The previous prime is 212121310221103. The next prime is 212121310221179. The reversal of 212121310221111 is 111122013121212.

212121310221111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212121310221111 - 2³ = 212121310221103 is a prime.

It is a super-4 number, since 4×212121310221111⁴ (a number of 58 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121310221181) 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, 1219087989690 + ... + 1219087989863.

It is an arithmetic number, because the mean of its divisors is an integer number (36572639693310).

Almost surely, 2^{212121310221111} is an apocalyptic number.

212121310221111 is a deficient number, since it is larger than the sum of its proper divisors (80459807325369).

212121310221111 is a wasteful number, since it uses less digits than its factorization.

212121310221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2438175979585.

The product of its (nonzero) digits is 96, while the sum is 21.

Adding to 212121310221111 its reverse (111122013121212), we get a palindrome (323243323342323).

The spelling of 212121310221111 in words is "two hundred twelve trillion, one hundred twenty-one billion, three hundred ten million, two hundred twenty-one thousand, one hundred eleven".