21212202210102 has 12 divisors (see below), whose sum is σ = 45959771455260. Its totient is φ = 7070734070028.

The previous prime is 21212202210083. The next prime is 21212202210103. The reversal of 21212202210102 is 20101220221212.

It is a happy number.

21212202210102 is a `hidden beast` number, since 2 + 121 + 220 + 221 + 0 + 102 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1178455678339 = 21212202210102 / (2 + 1 + 2 + 1 + 2 + 2 + 0 + 2 + 2 + 1 + 0 + 1 + 0 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212202210103) 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 5 ways as a sum of consecutive naturals, for example, 589227839152 + ... + 589227839187.

It is an arithmetic number, because the mean of its divisors is an integer number (3829980954605).

Almost surely, 2^{21212202210102} is an apocalyptic number.

21212202210102 is an abundant number, since it is smaller than the sum of its proper divisors (24747569245158).

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

21212202210102 is a wasteful number, since it uses less digits than its factorization.

21212202210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178455678347 (or 1178455678344 counting only the distinct ones).

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

Adding to 21212202210102 its reverse (20101220221212), we get a palindrome (41313422431314).

The spelling of 21212202210102 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, two hundred ten thousand, one hundred two".