21200412321 has 12 divisors (see below), whose sum is σ = 33406710480. Its totient is φ = 12848734680.

The previous prime is 21200412319. The next prime is 21200412361. The reversal of 21200412321 is 12321400212.

It is a happy number.

21200412321 is a `hidden beast` number, since 21 + 200 + 412 + 32 + 1 = 666.

It is not a de Polignac number, because 21200412321 - 2¹ = 21200412319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200412294 and 21200412303.

It is not an unprimeable number, because it can be changed into a prime (21200412361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107072691 + ... + 107072888.

It is an arithmetic number, because the mean of its divisors is an integer number (2783892540).

Almost surely, 2^21200412321 is an apocalyptic number.

It is an amenable number.

21200412321 is a deficient number, since it is larger than the sum of its proper divisors (12206298159).

21200412321 is a wasteful number, since it uses less digits than its factorization.

21200412321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214145596 (or 214145593 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21200412321 its reverse (12321400212), we get a palindrome (33521812533).

The spelling of 21200412321 in words is "twenty-one billion, two hundred million, four hundred twelve thousand, three hundred twenty-one".