21121212330206 has 16 divisors (see below), whose sum is σ = 33589077096960. Its totient is φ = 9926468935680.

The previous prime is 21121212330193. The next prime is 21121212330227. The reversal of 21121212330206 is 60203321212112.

It is a super-2 number, since 2×21121212330206² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403882910 + ... + 403935201.

It is an arithmetic number, because the mean of its divisors is an integer number (2099317318560).

Almost surely, 2^{21121212330206} is an apocalyptic number.

21121212330206 is a deficient number, since it is larger than the sum of its proper divisors (12467864766754).

21121212330206 is a wasteful number, since it uses less digits than its factorization.

21121212330206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807818899.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21121212330206 its reverse (60203321212112), we get a palindrome (81324533542318).

The spelling of 21121212330206 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, three hundred thirty thousand, two hundred six".