221213042105 has 24 divisors (see below), whose sum is σ = 294579699264. Its totient is φ = 158155258400.

The previous prime is 221213042101. The next prime is 221213042123. The reversal of 221213042105 is 501240312122.

It is not a de Polignac number, because 221213042105 - 2² = 221213042101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221213042101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 386261 + ... + 769170.

It is an arithmetic number, because the mean of its divisors is an integer number (12274154136).

Almost surely, 2^221213042105 is an apocalyptic number.

It is an amenable number.

221213042105 is a deficient number, since it is larger than the sum of its proper divisors (73366657159).

221213042105 is a wasteful number, since it uses less digits than its factorization.

221213042105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155565 (or 1155506 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 221213042105 its reverse (501240312122), we get a palindrome (722453354227).

The spelling of 221213042105 in words is "two hundred twenty-one billion, two hundred thirteen million, forty-two thousand, one hundred five".