2111021221867 has 2 divisors, whose sum is σ = 2111021221868. Its totient is φ = 2111021221866.

The previous prime is 2111021221853. The next prime is 2111021221913. The reversal of 2111021221867 is 7681221201112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2111021221867 - 2¹¹ = 2111021219819 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111021221567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055510610933 + 1055510610934.

It is an arithmetic number, because the mean of its divisors is an integer number (1055510610934).

Almost surely, 2^{2111021221867} is an apocalyptic number.

2111021221867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111021221867 is an equidigital number, since it uses as much as digits as its factorization.

2111021221867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 34.

Adding to 2111021221867 its reverse (7681221201112), we get a palindrome (9792242422979).

The spelling of 2111021221867 in words is "two trillion, one hundred eleven billion, twenty-one million, two hundred twenty-one thousand, eight hundred sixty-seven".