211700891849 has 4 divisors (see below), whose sum is σ = 211702331136. Its totient is φ = 211699452564.

The previous prime is 211700891839. The next prime is 211700891887. The reversal of 211700891849 is 948198007112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211700891849 - 2¹⁶ = 211700826313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211700891797 and 211700891806.

It is not an unprimeable number, because it can be changed into a prime (211700891839) 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, 470189 + ... + 802794.

It is an arithmetic number, because the mean of its divisors is an integer number (52925582784).

Almost surely, 2^211700891849 is an apocalyptic number.

It is an amenable number.

211700891849 is a deficient number, since it is larger than the sum of its proper divisors (1439287).

211700891849 is a wasteful number, since it uses less digits than its factorization.

211700891849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439286.

The product of its (nonzero) digits is 290304, while the sum is 50.

The spelling of 211700891849 in words is "two hundred eleven billion, seven hundred million, eight hundred ninety-one thousand, eight hundred forty-nine".