21021110012222 has 8 divisors (see below), whose sum is σ = 31681104189672. Its totient is φ = 10460741949000.

The previous prime is 21021110012209. The next prime is 21021110012293. The reversal of 21021110012222 is 22221001112012.

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

It is a super-2 number, since 2×21021110012222² (a number of 27 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 21021110012222.

It is a congruent number.

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, 24906528029 + ... + 24906528872.

It is an arithmetic number, because the mean of its divisors is an integer number (3960138023709).

Almost surely, 2^{21021110012222} is an apocalyptic number.

21021110012222 is a deficient number, since it is larger than the sum of its proper divisors (10659994177450).

21021110012222 is a wasteful number, since it uses less digits than its factorization.

21021110012222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49813057114.

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

Adding to 21021110012222 its reverse (22221001112012), we get a palindrome (43242111124234).

The spelling of 21021110012222 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, twelve thousand, two hundred twenty-two".