21232352212 has 12 divisors (see below), whose sum is σ = 37169152020. Its totient is φ = 10612594496.

The previous prime is 21232352203. The next prime is 21232352221. The reversal of 21232352212 is 21225323212.

It is an interprime number because it is at equal distance from previous prime (21232352203) and next prime (21232352221).

It can be written as a sum of positive squares in 2 ways, for example, as 9997200196 + 11235152016 = 99986^2 + 105996^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 882043 + ... + 905794.

It is an arithmetic number, because the mean of its divisors is an integer number (3097429335).

Almost surely, 2^21232352212 is an apocalyptic number.

It is an amenable number.

21232352212 is a deficient number, since it is larger than the sum of its proper divisors (15936799808).

21232352212 is a wasteful number, since it uses less digits than its factorization.

21232352212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790810 (or 1790808 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

Adding to 21232352212 its reverse (21225323212), we get a palindrome (42457675424).

The spelling of 21232352212 in words is "twenty-one billion, two hundred thirty-two million, three hundred fifty-two thousand, two hundred twelve".