21221200011213 has 48 divisors (see below), whose sum is σ = 31965291386496. Its totient is φ = 13553971885440.

The previous prime is 21221200011199. The next prime is 21221200011251. The reversal of 21221200011213 is 31211000212212.

21221200011213 is a `hidden beast` number, since 21 + 221 + 200 + 0 + 11 + 213 = 666.

It is not a de Polignac number, because 21221200011213 - 2⁴ = 21221200011197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221200011413) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18036795 + ... + 19177287.

It is an arithmetic number, because the mean of its divisors is an integer number (665943570552).

Almost surely, 2^{21221200011213} is an apocalyptic number.

It is an amenable number.

21221200011213 is a deficient number, since it is larger than the sum of its proper divisors (10744091375283).

21221200011213 is a wasteful number, since it uses less digits than its factorization.

21221200011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141394 (or 1141391 counting only the distinct ones).

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

Adding to 21221200011213 its reverse (31211000212212), we get a palindrome (52432200223425).

The spelling of 21221200011213 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, eleven thousand, two hundred thirteen".