21002201112221 has 12 divisors (see below), whose sum is σ = 24444189806400. Its totient is φ = 17992265056920.

The previous prime is 21002201112209. The next prime is 21002201112247. The reversal of 21002201112221 is 12221110220012.

It is a de Polignac number, because none of the positive numbers 2^k-21002201112221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002201112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002201112421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114450371 + ... + 114633728.

It is an arithmetic number, because the mean of its divisors is an integer number (2037015817200).

Almost surely, 2^{21002201112221} is an apocalyptic number.

It is an amenable number.

21002201112221 is a deficient number, since it is larger than the sum of its proper divisors (3441988694179).

21002201112221 is a wasteful number, since it uses less digits than its factorization.

21002201112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229085984 (or 229085977 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21002201112221 its reverse (12221110220012), we get a palindrome (33223311332233).

The spelling of 21002201112221 in words is "twenty-one trillion, two billion, two hundred one million, one hundred twelve thousand, two hundred twenty-one".