21106719 has 12 divisors (see below), whose sum is σ = 31005000. Its totient is φ = 13832304.

The previous prime is 21106717. The next prime is 21106721. The reversal of 21106719 is 91760112.

It is an interprime number because it is at equal distance from previous prime (21106717) and next prime (21106721).

It is not a de Polignac number, because 21106719 - 2¹ = 21106717 is a prime.

It is a super-2 number, since 2×21106719² = 890987173889922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21106692 and 21106701.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19344 + ... + 20405.

It is an arithmetic number, because the mean of its divisors is an integer number (2583750).

Almost surely, 2^21106719 is an apocalyptic number.

21106719 is a deficient number, since it is larger than the sum of its proper divisors (9898281).

21106719 is a wasteful number, since it uses less digits than its factorization.

21106719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39814 (or 39811 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21106719 is about 4594.2049366566. The cubic root of 21106719 is about 276.3589768171.

The spelling of 21106719 in words is "twenty-one million, one hundred six thousand, seven hundred nineteen".