2101212221111 has 2 divisors, whose sum is σ = 2101212221112. Its totient is φ = 2101212221110.

The previous prime is 2101212220993. The next prime is 2101212221131. The reversal of 2101212221111 is 1111222121012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101212221111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101212221111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101212221131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050606110555 + 1050606110556.

It is an arithmetic number, because the mean of its divisors is an integer number (1050606110556).

Almost surely, 2^{2101212221111} is an apocalyptic number.

2101212221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101212221111 is an equidigital number, since it uses as much as digits as its factorization.

2101212221111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2101212221111 its reverse (1111222121012), we get a palindrome (3212434342123).

The spelling of 2101212221111 in words is "two trillion, one hundred one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eleven".