21240222232 has 16 divisors (see below), whose sum is σ = 40033929600. Its totient is φ = 10564507680.

The previous prime is 21240222221. The next prime is 21240222293. The reversal of 21240222232 is 23222204212.

It is a super-2 number, since 2×21240222232² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6948807 + ... + 6951862.

It is an arithmetic number, because the mean of its divisors is an integer number (2502120600).

Almost surely, 2^21240222232 is an apocalyptic number.

It is an amenable number.

21240222232 is a deficient number, since it is larger than the sum of its proper divisors (18793707368).

21240222232 is a wasteful number, since it uses less digits than its factorization.

21240222232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13900866 (or 13900862 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21240222232 its reverse (23222204212), we get a palindrome (44462426444).

The spelling of 21240222232 in words is "twenty-one billion, two hundred forty million, two hundred twenty-two thousand, two hundred thirty-two".