211999494671 has 4 divisors (see below), whose sum is σ = 212002870200. Its totient is φ = 211996119144.

The previous prime is 211999494661. The next prime is 211999494769. The reversal of 211999494671 is 176494999112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211999494671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211999494661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1591736 + ... + 1719773.

It is an arithmetic number, because the mean of its divisors is an integer number (53000717550).

Almost surely, 2^211999494671 is an apocalyptic number.

211999494671 is a deficient number, since it is larger than the sum of its proper divisors (3375529).

211999494671 is an equidigital number, since it uses as much as digits as its factorization.

211999494671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3375528.

The product of its digits is 8817984, while the sum is 62.

The spelling of 211999494671 in words is "two hundred eleven billion, nine hundred ninety-nine million, four hundred ninety-four thousand, six hundred seventy-one".