21212221100102 has 4 divisors (see below), whose sum is σ = 31818331650156. Its totient is φ = 10606110550050.

The previous prime is 21212221100023. The next prime is 21212221100113. The reversal of 21212221100102 is 20100112221212.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×21212221100102³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303055275024 + ... + 5303055275027.

It is an arithmetic number, because the mean of its divisors is an integer number (7954582912539).

Almost surely, 2^{21212221100102} is an apocalyptic number.

21212221100102 is a deficient number, since it is larger than the sum of its proper divisors (10606110550054).

21212221100102 is a wasteful number, since it uses less digits than its factorization.

21212221100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606110550053.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212221100102 its reverse (20100112221212), we get a palindrome (41312333321314).

The spelling of 21212221100102 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred thousand, one hundred two".