11002212121221 has 16 divisors (see below), whose sum is σ = 16300294269120. Its totient is φ = 7334483740560.

The previous prime is 11002212121217. The next prime is 11002212121337. The reversal of 11002212121221 is 12212121220011.

11002212121221 is a `hidden beast` number, since 1 + 10 + 0 + 221 + 212 + 1 + 221 = 666.

It is not a de Polignac number, because 11002212121221 - 2² = 11002212121217 is a prime.

It is a super-4 number, since 4×11002212121221⁴ (a number of 53 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11002212121194 and 11002212121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11002212129221) 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, 8386770 + ... + 9609491.

It is an arithmetic number, because the mean of its divisors is an integer number (1018768391820).

Almost surely, 2^{11002212121221} is an apocalyptic number.

It is an amenable number.

11002212121221 is a deficient number, since it is larger than the sum of its proper divisors (5298082147899).

11002212121221 is a wasteful number, since it uses less digits than its factorization.

11002212121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18018913 (or 18018907 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11002212121221 its reverse (12212121220011), we get a palindrome (23214333341232).

The spelling of 11002212121221 in words is "eleven trillion, two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".