211083771047561 has 2 divisors, whose sum is σ = 211083771047562. Its totient is φ = 211083771047560.

The previous prime is 211083771047549. The next prime is 211083771047579. The reversal of 211083771047561 is 165740177380112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187124890009600 + 23958881037961 = 13679360^2 + 4894781^2 .

It is a cyclic number.

It is not a de Polignac number, because 211083771047561 - 2²² = 211083766853257 is a prime.

It is not a weakly prime, because it can be changed into another prime (211083771047161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105541885523780 + 105541885523781.

It is an arithmetic number, because the mean of its divisors is an integer number (105541885523781).

Almost surely, 2^{211083771047561} is an apocalyptic number.

It is an amenable number.

211083771047561 is a deficient number, since it is larger than the sum of its proper divisors (1).

211083771047561 is an equidigital number, since it uses as much as digits as its factorization.

211083771047561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1975680, while the sum is 53.

The spelling of 211083771047561 in words is "two hundred eleven trillion, eighty-three billion, seven hundred seventy-one million, forty-seven thousand, five hundred sixty-one".