211405330 has 16 divisors (see below), whose sum is σ = 380914560. Its totient is φ = 84476592.

The previous prime is 211405297. The next prime is 211405333. The reversal of 211405330 is 33504112.

It is a junction number, because it is equal to n+sod(n) for n = 211405298 and 211405307.

It is not an unprimeable number, because it can be changed into a prime (211405333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217 + ... + 20563.

It is an arithmetic number, because the mean of its divisors is an integer number (23807160).

Almost surely, 2^211405330 is an apocalyptic number.

211405330 is a deficient number, since it is larger than the sum of its proper divisors (169509230).

211405330 is a wasteful number, since it uses less digits than its factorization.

211405330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21393.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 211405330 is about 14539.7843862968. The cubic root of 211405330 is about 595.7151488526.

Adding to 211405330 its reverse (33504112), we get a palindrome (244909442).

The spelling of 211405330 in words is "two hundred eleven million, four hundred five thousand, three hundred thirty".