211343042421 has 24 divisors (see below), whose sum is σ = 348908736384. Its totient is φ = 120758804640.

The previous prime is 211343042381. The next prime is 211343042467. The reversal of 211343042421 is 124240343112.

211343042421 is a `hidden beast` number, since 2 + 113 + 4 + 304 + 242 + 1 = 666.

It is not a de Polignac number, because 211343042421 - 2⁶ = 211343042357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211343042821) 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, 825211 + ... + 1050551.

It is an arithmetic number, because the mean of its divisors is an integer number (14537864016).

Almost surely, 2^211343042421 is an apocalyptic number.

211343042421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211343042421 is a deficient number, since it is larger than the sum of its proper divisors (137565693963).

211343042421 is a wasteful number, since it uses less digits than its factorization.

211343042421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240241 (or 240238 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 211343042421 its reverse (124240343112), we get a palindrome (335583385533).

The spelling of 211343042421 in words is "two hundred eleven billion, three hundred forty-three million, forty-two thousand, four hundred twenty-one".