211231407 has 8 divisors (see below), whose sum is σ = 282144384. Its totient is φ = 140569688.

The previous prime is 211231403. The next prime is 211231429. The reversal of 211231407 is 704132112.

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

It is a cyclic number.

It is not a de Polignac number, because 211231407 - 2² = 211231403 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 60843 + ... + 64220.

It is an arithmetic number, because the mean of its divisors is an integer number (35268048).

Almost surely, 2^211231407 is an apocalyptic number.

211231407 is a deficient number, since it is larger than the sum of its proper divisors (70912977).

211231407 is a wasteful number, since it uses less digits than its factorization.

211231407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125629.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 211231407 is about 14533.8022210294. The cubic root of 211231407 is about 595.5517392361.

Adding to 211231407 its reverse (704132112), we get a palindrome (915363519).

The spelling of 211231407 in words is "two hundred eleven million, two hundred thirty-one thousand, four hundred seven".