21106707 has 16 divisors (see below), whose sum is σ = 29992320. Its totient is φ = 13156992.

The previous prime is 21106669. The next prime is 21106717. The reversal of 21106707 is 70760112.

It is not a de Polignac number, because 21106707 - 2⁶ = 21106643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21106717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7044 + ... + 9582.

It is an arithmetic number, because the mean of its divisors is an integer number (1874520).

Almost surely, 2^21106707 is an apocalyptic number.

21106707 is a deficient number, since it is larger than the sum of its proper divisors (8885613).

21106707 is a wasteful number, since it uses less digits than its factorization.

21106707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 21106707 is about 4594.2036306633. The cubic root of 21106707 is about 276.3589244434.

Adding to 21106707 its reverse (70760112), we get a palindrome (91866819).

The spelling of 21106707 in words is "twenty-one million, one hundred six thousand, seven hundred seven".