221212102 has 8 divisors (see below), whose sum is σ = 334351512. Its totient is φ = 109761600.

The previous prime is 221212099. The next prime is 221212111. The reversal of 221212102 is 201212122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct 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 in 3 ways as a sum of consecutive naturals, for example, 421899 + ... + 422422.

It is an arithmetic number, because the mean of its divisors is an integer number (41793939).

Almost surely, 2^221212102 is an apocalyptic number.

221212102 is a deficient number, since it is larger than the sum of its proper divisors (113139410).

221212102 is a wasteful number, since it uses less digits than its factorization.

221212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844454.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221212102 is about 14873.2007987521. The cubic root of 221212102 is about 604.7877150621.

Adding to 221212102 its reverse (201212122), we get a palindrome (422424224).

The spelling of 221212102 in words is "two hundred twenty-one million, two hundred twelve thousand, one hundred two".