21001202212222 has 4 divisors (see below), whose sum is σ = 31501803318336. Its totient is φ = 10500601106110.

The previous prime is 21001202212171. The next prime is 21001202212247. The reversal of 21001202212222 is 22221220210012.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21001202212222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250300553054 + ... + 5250300553057.

It is an arithmetic number, because the mean of its divisors is an integer number (7875450829584).

Almost surely, 2^{21001202212222} is an apocalyptic number.

21001202212222 is a deficient number, since it is larger than the sum of its proper divisors (10500601106114).

21001202212222 is a wasteful number, since it uses less digits than its factorization.

21001202212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500601106113.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21001202212222 its reverse (22221220210012), we get a palindrome (43222422422234).

The spelling of 21001202212222 in words is "twenty-one trillion, one billion, two hundred two million, two hundred twelve thousand, two hundred twenty-two".