21221211232 has 48 divisors (see below), whose sum is σ = 45664646832. Its totient is φ = 9648207360.

The previous prime is 21221211227. The next prime is 21221211247. The reversal of 21221211232 is 23211212212.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 352819 + ... + 408562.

It is an arithmetic number, because the mean of its divisors is an integer number (951346809).

Almost surely, 2^21221211232 is an apocalyptic number.

It is an amenable number.

21221211232 is an abundant number, since it is smaller than the sum of its proper divisors (24443435600).

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

21221211232 is a wasteful number, since it uses less digits than its factorization.

21221211232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761471 (or 761463 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

Adding to 21221211232 its reverse (23211212212), we get a palindrome (44432423444).

The spelling of 21221211232 in words is "twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred thirty-two".