20321212 has 12 divisors (see below), whose sum is σ = 35677936. Its totient is φ = 10127520.

The previous prime is 20321201. The next prime is 20321233. The reversal of 20321212 is 21212302.

It is a junction number, because it is equal to n+sod(n) for n = 20321192 and 20321201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6864 + ... + 9367.

Almost surely, 2^20321212 is an apocalyptic number.

It is an amenable number.

20321212 is a deficient number, since it is larger than the sum of its proper divisors (15356724).

20321212 is a wasteful number, since it uses less digits than its factorization.

20321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16548 (or 16546 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20321212 is about 4507.9055003405. The cubic root of 20321212 is about 272.8872232505.

Adding to 20321212 its reverse (21212302), we get a palindrome (41533514).

The spelling of 20321212 in words is "twenty million, three hundred twenty-one thousand, two hundred twelve".