21210122220102 has 40 divisors (see below), whose sum is σ = 47543102990856. Its totient is φ = 7067553762528.

The previous prime is 21210122220059. The next prime is 21210122220107. The reversal of 21210122220102 is 20102222101212.

It is a happy number.

21210122220102 is a `hidden beast` number, since 212 + 10 + 122 + 220 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210122220107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22565583 + ... + 23486714.

Almost surely, 2^{21210122220102} is an apocalyptic number.

21210122220102 is an abundant number, since it is smaller than the sum of its proper divisors (26332980770754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210122220102 is a wasteful number, since it uses less digits than its factorization.

21210122220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46055154 (or 46055145 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210122220102 its reverse (20102222101212), we get a palindrome (41312344321314).

The spelling of 21210122220102 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred twenty thousand, one hundred two".