21110221220122 has 8 divisors (see below), whose sum is σ = 31680636491700. Its totient is φ = 10550009056224.

The previous prime is 21110221220119. The next prime is 21110221220171. The reversal of 21110221220122 is 22102212201112.

It can be written as a sum of positive squares in 2 ways, for example, as 19876786638921 + 1233434581201 = 4458339^2 + 1110601^2 .

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 21110221220122.

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, 2550771747 + ... + 2550780022.

Almost surely, 2^{21110221220122} is an apocalyptic number.

21110221220122 is a deficient number, since it is larger than the sum of its proper divisors (10570415271578).

21110221220122 is a wasteful number, since it uses less digits than its factorization.

21110221220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5101553840.

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

Adding to 21110221220122 its reverse (22102212201112), we get a palindrome (43212433421234).

The spelling of 21110221220122 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".