211231406 has 8 divisors (see below), whose sum is σ = 316910880. Its totient is φ = 105594448.

The previous prime is 211231403. The next prime is 211231429. The reversal of 211231406 is 604132112.

211231406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211231403) 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, 9170 + ... + 22506.

It is an arithmetic number, because the mean of its divisors is an integer number (39613860).

Almost surely, 2^211231406 is an apocalyptic number.

211231406 is a deficient number, since it is larger than the sum of its proper divisors (105679474).

211231406 is a wasteful number, since it uses less digits than its factorization.

211231406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21258.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 211231406 is about 14533.8021866269. The cubic root of 211231406 is about 595.5517382963.

Adding to 211231406 its reverse (604132112), we get a palindrome (815363518).

The spelling of 211231406 in words is "two hundred eleven million, two hundred thirty-one thousand, four hundred six".