21212221102002 has 24 divisors (see below), whose sum is σ = 52525499871936. Its totient is φ = 6060634600536.

The previous prime is 21212221101991. The next prime is 21212221102021. The reversal of 21212221102002 is 20020112221212.

It is a happy number.

21212221102002 is a `hidden beast` number, since 21 + 212 + 221 + 10 + 200 + 2 = 666.

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 11 ways as a sum of consecutive naturals, for example, 84175480438 + ... + 84175480689.

It is an arithmetic number, because the mean of its divisors is an integer number (2188562494664).

Almost surely, 2^{21212221102002} is an apocalyptic number.

21212221102002 is an abundant number, since it is smaller than the sum of its proper divisors (31313278769934).

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

21212221102002 is a wasteful number, since it uses less digits than its factorization.

21212221102002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168350961142 (or 168350961139 counting only the distinct ones).

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

Adding to 21212221102002 its reverse (20020112221212), we get a palindrome (41232333323214).

The spelling of 21212221102002 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred two thousand, two".