211221210001091 has 2 divisors, whose sum is σ = 211221210001092. Its totient is φ = 211221210001090.

The previous prime is 211221210001057. The next prime is 211221210001211. The reversal of 211221210001091 is 190100012122112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221210001091 is a prime.

It is a super-2 number, since 2×211221210001091² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211221210001591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610605000545 + 105610605000546.

It is an arithmetic number, because the mean of its divisors is an integer number (105610605000546).

Almost surely, 2^{211221210001091} is an apocalyptic number.

211221210001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221210001091 is an equidigital number, since it uses as much as digits as its factorization.

211221210001091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 211221210001091 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, one thousand, ninety-one".