221012123 has 8 divisors (see below), whose sum is σ = 232780800. Its totient is φ = 209257128.

The previous prime is 221012119. The next prime is 221012149. The reversal of 221012123 is 321210122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221012123 - 2² = 221012119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221012098 and 221012107.

It is not an unprimeable number, because it can be changed into a prime (221012723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62090 + ... + 65552.

It is an arithmetic number, because the mean of its divisors is an integer number (29097600).

Almost surely, 2^221012123 is an apocalyptic number.

221012123 is a deficient number, since it is larger than the sum of its proper divisors (11768677).

221012123 is a wasteful number, since it uses less digits than its factorization.

221012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6841.

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

The square root of 221012123 is about 14866.4764823411. The cubic root of 221012123 is about 604.6054144480.

Adding to 221012123 its reverse (321210122), we get a palindrome (542222245).

The spelling of 221012123 in words is "two hundred twenty-one million, twelve thousand, one hundred twenty-three".