212121120111111 has 160 divisors (see below), whose sum is σ = 331299387353088. Its totient is φ = 135161490585600.

The previous prime is 212121120111101. The next prime is 212121120111161. The reversal of 212121120111111 is 111111021121212.

212121120111111 is a `hidden beast` number, since 212 + 1 + 211 + 20 + 111 + 111 = 666.

It is not a de Polignac number, because 212121120111111 - 2¹⁰ = 212121120110087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121120111101) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 20648405271 + ... + 20648415543.

Almost surely, 2^{212121120111111} is an apocalyptic number.

212121120111111 is a deficient number, since it is larger than the sum of its proper divisors (119178267241977).

212121120111111 is a wasteful number, since it uses less digits than its factorization.

212121120111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11163 (or 11154 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 212121120111111 its reverse (111111021121212), we get a palindrome (323232141232323).

The spelling of 212121120111111 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, one hundred eleven".