2121222121111 has 2 divisors, whose sum is σ = 2121222121112. Its totient is φ = 2121222121110.

The previous prime is 2121222121091. The next prime is 2121222121121. The reversal of 2121222121111 is 1111212221212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121222121111 - 2¹¹ = 2121222119063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121222121121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611060555 + 1060611060556.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611060556).

Almost surely, 2^{2121222121111} is an apocalyptic number.

2121222121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222121111 is an equidigital number, since it uses as much as digits as its factorization.

2121222121111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64, while the sum is 19.

Adding to 2121222121111 its reverse (1111212221212), we get a palindrome (3232434342323).

The spelling of 2121222121111 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".