211063075981 has 2 divisors, whose sum is σ = 211063075982. Its totient is φ = 211063075980.

The previous prime is 211063075973. The next prime is 211063075991. The reversal of 211063075981 is 189570360112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122636538025 + 88426537956 = 350195^2 + 297366^2 .

It is a cyclic number.

It is not a de Polignac number, because 211063075981 - 2³ = 211063075973 is a prime.

It is a super-2 number, since 2×211063075981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211063075991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105531537990 + 105531537991.

It is an arithmetic number, because the mean of its divisors is an integer number (105531537991).

Almost surely, 2^211063075981 is an apocalyptic number.

It is an amenable number.

211063075981 is a deficient number, since it is larger than the sum of its proper divisors (1).

211063075981 is an equidigital number, since it uses as much as digits as its factorization.

211063075981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 211063075981 in words is "two hundred eleven billion, sixty-three million, seventy-five thousand, nine hundred eighty-one".