21112110212122 has 16 divisors (see below), whose sum is σ = 32760380422440. Its totient is φ = 10191988058112.

The previous prime is 21112110212117. The next prime is 21112110212131. The reversal of 21112110212122 is 22121201121112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20713685410441 + 398424801681 = 4551229^2 + 631209^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21112110212122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8704018 + ... + 10862050.

Almost surely, 2^{21112110212122} is an apocalyptic number.

21112110212122 is a deficient number, since it is larger than the sum of its proper divisors (11648270210318).

21112110212122 is a wasteful number, since it uses less digits than its factorization.

21112110212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326737.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21112110212122 its reverse (22121201121112), we get a palindrome (43233311333234).

The spelling of 21112110212122 in words is "twenty-one trillion, one hundred twelve billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-two".