211431433421 has 8 divisors (see below), whose sum is σ = 227869620384. Its totient is φ = 195018136560.

The previous prime is 211431433373. The next prime is 211431433457. The reversal of 211431433421 is 124334134112.

211431433421 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 not a de Polignac number, because 211431433421 - 2⁶ = 211431433357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211431433121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6204875 + ... + 6238856.

It is an arithmetic number, because the mean of its divisors is an integer number (28483702548).

Almost surely, 2^211431433421 is an apocalyptic number.

It is an amenable number.

211431433421 is a deficient number, since it is larger than the sum of its proper divisors (16438186963).

211431433421 is a wasteful number, since it uses less digits than its factorization.

211431433421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12445051.

The product of its digits is 6912, while the sum is 29.

Adding to 211431433421 its reverse (124334134112), we get a palindrome (335765567533).

The spelling of 211431433421 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred thirty-three thousand, four hundred twenty-one".