21212102202 has 16 divisors (see below), whose sum is σ = 42861568512. Its totient is φ = 6997806720.

The previous prime is 21212102201. The next prime is 21212102237. The reversal of 21212102202 is 20220121212.

It is a super-3 number, since 3×21212102202³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212102201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18222874 + ... + 18224037.

It is an arithmetic number, because the mean of its divisors is an integer number (2678848032).

Almost surely, 2^21212102202 is an apocalyptic number.

21212102202 is an abundant number, since it is smaller than the sum of its proper divisors (21649466310).

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

21212102202 is a wasteful number, since it uses less digits than its factorization.

21212102202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36447013.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212102202 its reverse (20220121212), we get a palindrome (41432223414).

The spelling of 21212102202 in words is "twenty-one billion, two hundred twelve million, one hundred two thousand, two hundred two".