21002112221122 has 8 divisors (see below), whose sum is σ = 31504324365756. Its totient is φ = 10500670765872.

The previous prime is 21002112221087. The next prime is 21002112221177. The reversal of 21002112221122 is 22112221120012.

It can be written as a sum of positive squares in 2 ways, for example, as 18319949392761 + 2682162828361 = 4280181^2 + 1637731^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21002112221122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192604213 + ... + 192713224.

Almost surely, 2^{21002112221122} is an apocalyptic number.

21002112221122 is a deficient number, since it is larger than the sum of its proper divisors (10502212144634).

21002112221122 is a wasteful number, since it uses less digits than its factorization.

21002112221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385344692.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21002112221122 its reverse (22112221120012), we get a palindrome (43114333341134).

The spelling of 21002112221122 in words is "twenty-one trillion, two billion, one hundred twelve million, two hundred twenty-one thousand, one hundred twenty-two".