211221043404 has 48 divisors (see below), whose sum is σ = 563284044288. Its totient is φ = 60345877248.

The previous prime is 211221043381. The next prime is 211221043409. The reversal of 211221043404 is 404340122112.

It is a super-2 number, since 2×211221043404² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221043409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2075764 + ... + 2175140.

It is an arithmetic number, because the mean of its divisors is an integer number (11735084256).

Almost surely, 2^211221043404 is an apocalyptic number.

It is an amenable number.

211221043404 is an abundant number, since it is smaller than the sum of its proper divisors (352063000884).

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

211221043404 is a wasteful number, since it uses less digits than its factorization.

211221043404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124694 (or 124692 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 211221043404 its reverse (404340122112), we get a palindrome (615561165516).

The spelling of 211221043404 in words is "two hundred eleven billion, two hundred twenty-one million, forty-three thousand, four hundred four".