106660821 has 8 divisors (see below), whose sum is σ = 148397760. Its totient is φ = 68015552.

The previous prime is 106660819. The next prime is 106660861. The reversal of 106660821 is 128066601.

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 106660821 - 2¹ = 106660819 is a prime.

It is a super-2 number, since 2×106660821² = 22753061472788082, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106660861) 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, 772836 + ... + 772973.

It is an arithmetic number, because the mean of its divisors is an integer number (18549720).

Almost surely, 2^106660821 is an apocalyptic number.

It is an amenable number.

106660821 is a deficient number, since it is larger than the sum of its proper divisors (41736939).

106660821 is a wasteful number, since it uses less digits than its factorization.

106660821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545835.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 106660821 is about 10327.6725838884. The cubic root of 106660821 is about 474.2437769351.

The spelling of 106660821 in words is "one hundred six million, six hundred sixty thousand, eight hundred twenty-one".