106278921 has 12 divisors (see below), whose sum is σ = 175444672. Its totient is φ = 60730776.

The previous prime is 106278919. The next prime is 106278947. The reversal of 106278921 is 129872601.

106278921 is a `hidden beast` number, since 1 + 0 + 627 + 8 + 9 + 21 = 666.

It is not a de Polignac number, because 106278921 - 2¹ = 106278919 is a prime.

It is a super-2 number, since 2×106278921² = 22590418097848482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106278961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 843421 + ... + 843546.

Almost surely, 2^106278921 is an apocalyptic number.

It is an amenable number.

106278921 is a deficient number, since it is larger than the sum of its proper divisors (69165751).

106278921 is a wasteful number, since it uses less digits than its factorization.

106278921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686980 (or 1686977 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 106278921 is about 10309.1668431547. The cubic root of 106278921 is about 473.6770887253.

The spelling of 106278921 in words is "one hundred six million, two hundred seventy-eight thousand, nine hundred twenty-one".