1221020102111 has 2 divisors, whose sum is σ = 1221020102112. Its totient is φ = 1221020102110.

The previous prime is 1221020102089. The next prime is 1221020102153. The reversal of 1221020102111 is 1112010201221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221020102111 - 2¹⁰ = 1221020101087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221020102711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510051055 + 610510051056.

It is an arithmetic number, because the mean of its divisors is an integer number (610510051056).

Almost surely, 2^{1221020102111} is an apocalyptic number.

1221020102111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221020102111 is an equidigital number, since it uses as much as digits as its factorization.

1221020102111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221020102111 its reverse (1112010201221), we get a palindrome (2333030303332).

The spelling of 1221020102111 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred two thousand, one hundred eleven".