211986745787 has 2 divisors, whose sum is σ = 211986745788. Its totient is φ = 211986745786.

The previous prime is 211986745781. The next prime is 211986745837. The reversal of 211986745787 is 787547689112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211986745787 - 2¹⁰ = 211986744763 is a prime.

It is not a weakly prime, because it can be changed into another prime (211986745781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105993372893 + 105993372894.

It is an arithmetic number, because the mean of its divisors is an integer number (105993372894).

Almost surely, 2^211986745787 is an apocalyptic number.

211986745787 is a deficient number, since it is larger than the sum of its proper divisors (1).

211986745787 is an equidigital number, since it uses as much as digits as its factorization.

211986745787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47416320, while the sum is 65.

The spelling of 211986745787 in words is "two hundred eleven billion, nine hundred eighty-six million, seven hundred forty-five thousand, seven hundred eighty-seven".