21212101202202 has 96 divisors (see below), whose sum is σ = 47079628727040. Its totient is φ = 6900401249280.

The previous prime is 21212101202189. The next prime is 21212101202213. The reversal of 21212101202202 is 20220210121212.

It is a happy number.

21212101202202 is a `hidden beast` number, since 212 + 1 + 210 + 1 + 20 + 220 + 2 = 666.

It is a super-3 number, since 3×21212101202202³ (a number of 41 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 310815999 + ... + 310884237.

It is an arithmetic number, because the mean of its divisors is an integer number (490412799240).

Almost surely, 2^{21212101202202} is an apocalyptic number.

21212101202202 is an abundant number, since it is smaller than the sum of its proper divisors (25867527524838).

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

21212101202202 is a wasteful number, since it uses less digits than its factorization.

21212101202202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70708 (or 70705 counting only the distinct ones).

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

Adding to 21212101202202 its reverse (20220210121212), we get a palindrome (41432311323414).

The spelling of 21212101202202 in words is "twenty-one trillion, two hundred twelve billion, one hundred one million, two hundred two thousand, two hundred two".