21212011100223 has 16 divisors (see below), whose sum is σ = 31425288501600. Its totient is φ = 14141301641280.

The previous prime is 21212011100177. The next prime is 21212011100257. The reversal of 21212011100223 is 32200111021212.

21212011100223 is a `hidden beast` number, since 212 + 120 + 1 + 110 + 0 + 223 = 666.

It is not a de Polignac number, because 21212011100223 - 2¹³ = 21212011092031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212011100196 and 21212011100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212011100923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11524753 + ... + 13237973.

It is an arithmetic number, because the mean of its divisors is an integer number (1964080531350).

Almost surely, 2^{21212011100223} is an apocalyptic number.

21212011100223 is a deficient number, since it is larger than the sum of its proper divisors (10213277401377).

21212011100223 is a wasteful number, since it uses less digits than its factorization.

21212011100223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171799 (or 2171793 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21212011100223 its reverse (32200111021212), we get a palindrome (53412122121435).

The spelling of 21212011100223 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one hundred thousand, two hundred twenty-three".