211431413421 has 24 divisors (see below), whose sum is σ = 309065265600. Its totient is φ = 139267904256.

The previous prime is 211431413419. The next prime is 211431413423. The reversal of 211431413421 is 124314134112.

It is a happy number.

211431413421 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 314 + 1 + 342 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (211431413419) and next prime (211431413423).

It is not a de Polignac number, because 211431413421 - 2¹ = 211431413419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211431413423) 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, 320766 + ... + 725088.

It is an arithmetic number, because the mean of its divisors is an integer number (12877719400).

Almost surely, 2^211431413421 is an apocalyptic number.

It is an amenable number.

211431413421 is a deficient number, since it is larger than the sum of its proper divisors (97633852179).

211431413421 is a wasteful number, since it uses less digits than its factorization.

211431413421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405025 (or 405022 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

Adding to 211431413421 its reverse (124314134112), we get a palindrome (335745547533).

The spelling of 211431413421 in words is "two hundred eleven billion, four hundred thirty-one million, four hundred thirteen thousand, four hundred twenty-one".