211828897 has 4 divisors (see below), whose sum is σ = 242090176. Its totient is φ = 181567620.

The previous prime is 211828849. The next prime is 211828901. The reversal of 211828897 is 798828112.

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 a de Polignac number, because none of the positive numbers 2^k-211828897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211858897) 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, 15130629 + ... + 15130642.

It is an arithmetic number, because the mean of its divisors is an integer number (60522544).

Almost surely, 2^211828897 is an apocalyptic number.

It is an amenable number.

211828897 is a deficient number, since it is larger than the sum of its proper divisors (30261279).

211828897 is an equidigital number, since it uses as much as digits as its factorization.

211828897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30261278.

The product of its digits is 129024, while the sum is 46.

The square root of 211828897 is about 14554.3428913847. The cubic root of 211828897 is about 596.1127372956.

The spelling of 211828897 in words is "two hundred eleven million, eight hundred twenty-eight thousand, eight hundred ninety-seven".