21113002221 has 8 divisors (see below), whose sum is σ = 28319237184. Its totient is φ = 13991051040.

The previous prime is 21113002199. The next prime is 21113002231. The reversal of 21113002221 is 12220031112.

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

It is not a de Polignac number, because 21113002221 - 2¹⁰ = 21113001197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113002231) 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, 21070360 + ... + 21071361.

It is an arithmetic number, because the mean of its divisors is an integer number (3539904648).

Almost surely, 2^21113002221 is an apocalyptic number.

It is an amenable number.

21113002221 is a deficient number, since it is larger than the sum of its proper divisors (7206234963).

21113002221 is a wasteful number, since it uses less digits than its factorization.

21113002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42141891.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21113002221 its reverse (12220031112), we get a palindrome (33333033333).

The spelling of 21113002221 in words is "twenty-one billion, one hundred thirteen million, two thousand, two hundred twenty-one".