221212102102 has 4 divisors (see below), whose sum is σ = 331818153156. Its totient is φ = 110606051050.

The previous prime is 221212102099. The next prime is 221212102121. The reversal of 221212102102 is 201201212122.

It is a happy number.

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

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, 55303025524 + ... + 55303025527.

It is an arithmetic number, because the mean of its divisors is an integer number (82954538289).

Almost surely, 2^221212102102 is an apocalyptic number.

221212102102 is a deficient number, since it is larger than the sum of its proper divisors (110606051054).

221212102102 is a wasteful number, since it uses less digits than its factorization.

221212102102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110606051053.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221212102102 its reverse (201201212122), we get a palindrome (422413314224).

The spelling of 221212102102 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred two".