211131329977 has 2 divisors, whose sum is σ = 211131329978. Its totient is φ = 211131329976.

The previous prime is 211131329971. The next prime is 211131330037. The reversal of 211131329977 is 779923131112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197410487481 + 13720842496 = 444309^2 + 117136^2 .

It is a cyclic number.

It is not a de Polignac number, because 211131329977 - 2²³ = 211122941369 is a prime.

It is not a weakly prime, because it can be changed into another prime (211131329971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565664988 + 105565664989.

It is an arithmetic number, because the mean of its divisors is an integer number (105565664989).

Almost surely, 2^211131329977 is an apocalyptic number.

It is an amenable number.

211131329977 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131329977 is an equidigital number, since it uses as much as digits as its factorization.

211131329977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 46.

The spelling of 211131329977 in words is "two hundred eleven billion, one hundred thirty-one million, three hundred twenty-nine thousand, nine hundred seventy-seven".