211404031421 has 12 divisors (see below), whose sum is σ = 241085614560. Its totient is φ = 183829587480.

The previous prime is 211404031381. The next prime is 211404031439. The reversal of 211404031421 is 124130404112.

211404031421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-211404031421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211404031021) 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 11 ways as a sum of consecutive naturals, for example, 18159161 + ... + 18170798.

It is an arithmetic number, because the mean of its divisors is an integer number (20090467880).

Almost surely, 2^211404031421 is an apocalyptic number.

It is an amenable number.

211404031421 is a deficient number, since it is larger than the sum of its proper divisors (29681583139).

211404031421 is a wasteful number, since it uses less digits than its factorization.

211404031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36330016 (or 36329993 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 211404031421 its reverse (124130404112), we get a palindrome (335534435533).

The spelling of 211404031421 in words is "two hundred eleven billion, four hundred four million, thirty-one thousand, four hundred twenty-one".