21110002221 has 32 divisors (see below), whose sum is σ = 35121632256. Its totient is φ = 10956960000.

The previous prime is 21110002213. The next prime is 21110002247. The reversal of 21110002221 is 12220001112.

It is not a de Polignac number, because 21110002221 - 2³ = 21110002213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110002197 and 21110002206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110002211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239386 + ... + 315476.

It is an arithmetic number, because the mean of its divisors is an integer number (1097551008).

Almost surely, 2^21110002221 is an apocalyptic number.

21110002221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21110002221 is a deficient number, since it is larger than the sum of its proper divisors (14011630035).

21110002221 is a wasteful number, since it uses less digits than its factorization.

21110002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77313.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21110002221 its reverse (12220001112), we get a palindrome (33330003333).

The spelling of 21110002221 in words is "twenty-one billion, one hundred ten million, two thousand, two hundred twenty-one".