211247992991 has 16 divisors (see below), whose sum is σ = 243996985344. Its totient is φ = 179151645024.

The previous prime is 211247992951. The next prime is 211247993009. The reversal of 211247992991 is 199299742112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211247992991 - 2⁶ = 211247992927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211247992951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160676 + ... + 669561.

It is an arithmetic number, because the mean of its divisors is an integer number (15249811584).

Almost surely, 2^211247992991 is an apocalyptic number.

211247992991 is a deficient number, since it is larger than the sum of its proper divisors (32748992353).

211247992991 is a wasteful number, since it uses less digits than its factorization.

211247992991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830630.

The product of its digits is 1469664, while the sum is 56.

The spelling of 211247992991 in words is "two hundred eleven billion, two hundred forty-seven million, nine hundred ninety-two thousand, nine hundred ninety-one".