211221043434 has 12 divisors (see below), whose sum is σ = 457645594146. Its totient is φ = 70407014472.

The previous prime is 211221043433. The next prime is 211221043463. The reversal of 211221043434 is 434340122112.

211221043434 is a `hidden beast` number, since 2 + 1 + 1 + 221 + 0 + 4 + 3 + 434 = 666.

It can be written as a sum of positive squares in only one way, i.e., 143904146409 + 67316897025 = 379347^2 + 259455^2 .

It is a super-2 number, since 2×211221043434² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221043398 and 211221043407.

It is not an unprimeable number, because it can be changed into a prime (211221043433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5867251189 + ... + 5867251224.

Almost surely, 2^211221043434 is an apocalyptic number.

211221043434 is an abundant number, since it is smaller than the sum of its proper divisors (246424550712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221043434 is a wasteful number, since it uses less digits than its factorization.

211221043434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11734502421 (or 11734502418 counting only the distinct ones).

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

Adding to 211221043434 its reverse (434340122112), we get a palindrome (645561165546).

The spelling of 211221043434 in words is "two hundred eleven billion, two hundred twenty-one million, forty-three thousand, four hundred thirty-four".