211220030991911 has 2 divisors, whose sum is σ = 211220030991912. Its totient is φ = 211220030991910.

The previous prime is 211220030991877. The next prime is 211220030991967. The reversal of 211220030991911 is 119199030022112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211220030991911 is a prime.

It is a super-2 number, since 2×211220030991911² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220030991971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610015495955 + 105610015495956.

It is an arithmetic number, because the mean of its divisors is an integer number (105610015495956).

Almost surely, 2^{211220030991911} is an apocalyptic number.

211220030991911 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220030991911 is an equidigital number, since it uses as much as digits as its factorization.

211220030991911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 211220030991911 in words is "two hundred eleven trillion, two hundred twenty billion, thirty million, nine hundred ninety-one thousand, nine hundred eleven".