211999494769 has 2 divisors, whose sum is σ = 211999494770. Its totient is φ = 211999494768.

The previous prime is 211999494661. The next prime is 211999494841. The reversal of 211999494769 is 967494999112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175628046400 + 36371448369 = 419080^2 + 190713^2 .

It is a cyclic number.

It is not a de Polignac number, because 211999494769 - 2¹⁵ = 211999462001 is a prime.

It is a super-2 number, since 2×211999494769² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211999494698 and 211999494707.

It is not a weakly prime, because it can be changed into another prime (211999494569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105999747384 + 105999747385.

It is an arithmetic number, because the mean of its divisors is an integer number (105999747385).

Almost surely, 2^211999494769 is an apocalyptic number.

It is an amenable number.

211999494769 is a deficient number, since it is larger than the sum of its proper divisors (1).

211999494769 is an equidigital number, since it uses as much as digits as its factorization.

211999494769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79361856, while the sum is 70.

The spelling of 211999494769 in words is "two hundred eleven billion, nine hundred ninety-nine million, four hundred ninety-four thousand, seven hundred sixty-nine".