21106677 has 16 divisors (see below), whose sum is σ = 29131200. Its totient is φ = 13584000.

The previous prime is 21106669. The next prime is 21106717. The reversal of 21106677 is 77660112.

It is a happy number.

It is not a de Polignac number, because 21106677 - 2³ = 21106669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106607) 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 15 ways as a sum of consecutive naturals, for example, 11574 + ... + 13272.

It is an arithmetic number, because the mean of its divisors is an integer number (1820700).

Almost surely, 2^21106677 is an apocalyptic number.

It is an amenable number.

21106677 is a deficient number, since it is larger than the sum of its proper divisors (8024523).

21106677 is a wasteful number, since it uses less digits than its factorization.

21106677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21106677 is about 4594.2003656784. The cubic root of 21106677 is about 276.3587935092.

Adding to 21106677 its reverse (77660112), we get a palindrome (98766789).

The spelling of 21106677 in words is "twenty-one million, one hundred six thousand, six hundred seventy-seven".