21110202221 has 8 divisors (see below), whose sum is σ = 21627031104. Its totient is φ = 20593466080.

The previous prime is 21110202199. The next prime is 21110202227. The reversal of 21110202221 is 12220201112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110202196 and 21110202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110202227) 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, 744710 + ... + 772536.

It is an arithmetic number, because the mean of its divisors is an integer number (2703378888).

Almost surely, 2^21110202221 is an apocalyptic number.

It is an amenable number.

21110202221 is a deficient number, since it is larger than the sum of its proper divisors (516828883).

21110202221 is a wasteful number, since it uses less digits than its factorization.

21110202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46371.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21110202221 its reverse (12220201112), we get a palindrome (33330403333).

The spelling of 21110202221 in words is "twenty-one billion, one hundred ten million, two hundred two thousand, two hundred twenty-one".