221212220102 has 4 divisors (see below), whose sum is σ = 331818330156. Its totient is φ = 110606110050.

The previous prime is 221212220083. The next prime is 221212220137. The reversal of 221212220102 is 201022212122.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55303055024 + ... + 55303055027.

It is an arithmetic number, because the mean of its divisors is an integer number (82954582539).

Almost surely, 2^221212220102 is an apocalyptic number.

221212220102 is a deficient number, since it is larger than the sum of its proper divisors (110606110054).

221212220102 is a wasteful number, since it uses less digits than its factorization.

221212220102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110606110053.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221212220102 its reverse (201022212122), we get a palindrome (422234432224).

The spelling of 221212220102 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred two".