221012107 has 4 divisors (see below), whose sum is σ = 221061240. Its totient is φ = 220962976.

The previous prime is 221012081. The next prime is 221012111. The reversal of 221012107 is 701210122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221012177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17053 + ... + 27070.

It is an arithmetic number, because the mean of its divisors is an integer number (55265310).

Almost surely, 2^221012107 is an apocalyptic number.

221012107 is a deficient number, since it is larger than the sum of its proper divisors (49133).

221012107 is an equidigital number, since it uses as much as digits as its factorization.

221012107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49132.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 221012107 is about 14866.4759442176. The cubic root of 221012107 is about 604.6053998580.

Adding to 221012107 its reverse (701210122), we get a palindrome (922222229).

The spelling of 221012107 in words is "two hundred twenty-one million, twelve thousand, one hundred seven".