21221102213 has 8 divisors (see below), whose sum is σ = 21501110400. Its totient is φ = 20941378848.

The previous prime is 21221102209. The next prime is 21221102249. The reversal of 21221102213 is 31220112212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221102213 - 2² = 21221102209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221102191 and 21221102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221104213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80918 + ... + 221336.

It is an arithmetic number, because the mean of its divisors is an integer number (2687638800).

Almost surely, 2^21221102213 is an apocalyptic number.

It is an amenable number.

21221102213 is a deficient number, since it is larger than the sum of its proper divisors (280008187).

21221102213 is a wasteful number, since it uses less digits than its factorization.

21221102213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142411.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21221102213 its reverse (31220112212), we get a palindrome (52441214425).

Subtracting 21221102213 from its reverse (31220112212), we obtain a palindrome (9999009999).

The spelling of 21221102213 in words is "twenty-one billion, two hundred twenty-one million, one hundred two thousand, two hundred thirteen".