1221006106 has 8 divisors (see below), whose sum is σ = 1911140064. Its totient is φ = 583959420.

The previous prime is 1221006071. The next prime is 1221006131. The reversal of 1221006106 is 6016001221.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13271760 + ... + 13271851.

It is an arithmetic number, because the mean of its divisors is an integer number (238892508).

Almost surely, 2^1221006106 is an apocalyptic number.

1221006106 is a deficient number, since it is larger than the sum of its proper divisors (690133958).

1221006106 is a wasteful number, since it uses less digits than its factorization.

1221006106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26543636.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1221006106 is about 34942.8977905382. The cubic root of 1221006106 is about 1068.8233800898.

Adding to 1221006106 its reverse (6016001221), we get a palindrome (7237007327).

The spelling of 1221006106 in words is "one billion, two hundred twenty-one million, six thousand, one hundred six".