211971430 has 48 divisors (see below), whose sum is σ = 422301600. Its totient is φ = 76545920.

The previous prime is 211971421. The next prime is 211971437. The reversal of 211971430 is 34179112.

211971430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211971437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201546 + ... + 202594.

It is an arithmetic number, because the mean of its divisors is an integer number (8797950).

Almost surely, 2^211971430 is an apocalyptic number.

211971430 is a deficient number, since it is larger than the sum of its proper divisors (210330170).

211971430 is a wasteful number, since it uses less digits than its factorization.

211971430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 211971430 is about 14559.2386476766. The cubic root of 211971430 is about 596.2464091541.

The spelling of 211971430 in words is "two hundred eleven million, nine hundred seventy-one thousand, four hundred thirty".