221210002221 has 16 divisors (see below), whose sum is σ = 318323913600. Its totient is φ = 135833929920.

The previous prime is 221210002217. The next prime is 221210002229. The reversal of 221210002221 is 122200012122.

It is not a de Polignac number, because 221210002221 - 2² = 221210002217 is a prime.

It is a super-2 number, since 2×221210002221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221210002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210002229) 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, 6133921 + ... + 6169878.

It is an arithmetic number, because the mean of its divisors is an integer number (19895244600).

Almost surely, 2^221210002221 is an apocalyptic number.

It is an amenable number.

221210002221 is a deficient number, since it is larger than the sum of its proper divisors (97113911379).

221210002221 is a wasteful number, since it uses less digits than its factorization.

221210002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12304276.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221210002221 its reverse (122200012122), we get a palindrome (343410014343).

Subtracting from 221210002221 its reverse (122200012122), we obtain a palindrome (99009990099).

The spelling of 221210002221 in words is "two hundred twenty-one billion, two hundred ten million, two thousand, two hundred twenty-one".