21212101020222 has 48 divisors (see below), whose sum is σ = 54336416415840. Its totient is φ = 5851614073536.

The previous prime is 21212101020157. The next prime is 21212101020259. The reversal of 21212101020222 is 22202010121212.

It is a happy number.

21212101020222 is a `hidden beast` number, since 212 + 1 + 210 + 1 + 0 + 20 + 222 = 666.

It is a super-3 number, since 3×21212101020222³ (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 a junction number, because it is equal to n+sod(n) for n = 21212101020195 and 21212101020204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2902582693 + ... + 2902590000.

It is an arithmetic number, because the mean of its divisors is an integer number (1132008675330).

Almost surely, 2^{21212101020222} is an apocalyptic number.

21212101020222 is an abundant number, since it is smaller than the sum of its proper divisors (33124315395618).

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

21212101020222 is a wasteful number, since it uses less digits than its factorization.

21212101020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805172737 (or 5805172734 counting only the distinct ones).

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

Adding to 21212101020222 its reverse (22202010121212), we get a palindrome (43414111141434).

The spelling of 21212101020222 in words is "twenty-one trillion, two hundred twelve billion, one hundred one million, twenty thousand, two hundred twenty-two".