221212103 has 8 divisors (see below), whose sum is σ = 252912672. Its totient is φ = 189536256.

The previous prime is 221212099. The next prime is 221212111. The reversal of 221212103 is 301212122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221212103 - 2² = 221212099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212133) 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, 20951 + ... + 29687.

It is an arithmetic number, because the mean of its divisors is an integer number (31614084).

Almost surely, 2^221212103 is an apocalyptic number.

221212103 is a deficient number, since it is larger than the sum of its proper divisors (31700569).

221212103 is an equidigital number, since it uses as much as digits as its factorization.

221212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12361.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221212103 is about 14873.2008323696. The cubic root of 221212103 is about 604.7877159734.

Adding to 221212103 its reverse (301212122), we get a palindrome (522424225).

The spelling of 221212103 in words is "two hundred twenty-one million, two hundred twelve thousand, one hundred three".