2221200211991 has 2 divisors, whose sum is σ = 2221200211992. Its totient is φ = 2221200211990.

The previous prime is 2221200211981. The next prime is 2221200212041. The reversal of 2221200211991 is 1991120021222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221200211991 - 2⁶ = 2221200211927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221200211931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110600105995 + 1110600105996.

It is an arithmetic number, because the mean of its divisors is an integer number (1110600105996).

Almost surely, 2^{2221200211991} is an apocalyptic number.

2221200211991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221200211991 is an equidigital number, since it uses as much as digits as its factorization.

2221200211991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 2221200211991 in words is "two trillion, two hundred twenty-one billion, two hundred million, two hundred eleven thousand, nine hundred ninety-one".