21220210122112 has 16 divisors (see below), whose sum is σ = 42274637352900. Its totient is φ = 10610105060992.

The previous prime is 21220210122071. The next prime is 21220210122157. The reversal of 21220210122112 is 21122101202212.

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 21220210122112.

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, 82891445662 + ... + 82891445917.

Almost surely, 2^{21220210122112} is an apocalyptic number.

It is an amenable number.

21220210122112 is a deficient number, since it is larger than the sum of its proper divisors (21054427230788).

21220210122112 is an equidigital number, since it uses as much as digits as its factorization.

21220210122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165782891593 (or 165782891581 counting only the distinct ones).

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

Adding to 21220210122112 its reverse (21122101202212), we get a palindrome (42342311324324).

The spelling of 21220210122112 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, one hundred twenty-two thousand, one hundred twelve".