21096406 has 8 divisors (see below), whose sum is σ = 31728384. Its totient is φ = 10520280.

The previous prime is 21096391. The next prime is 21096409. The reversal of 21096406 is 60469012.

21096406 is nontrivially palindromic in base 15.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21096406² = 890116692233672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13005 + ... + 14536.

It is an arithmetic number, because the mean of its divisors is an integer number (3966048).

Almost surely, 2^21096406 is an apocalyptic number.

21096406 is a deficient number, since it is larger than the sum of its proper divisors (10631978).

21096406 is a wasteful number, since it uses less digits than its factorization.

21096406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27926.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21096406 is about 4593.0824072729. The cubic root of 21096406 is about 276.3139586967.

It can be divided in two parts, 2109 and 6406, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 21096406 in words is "twenty-one million, ninety-six thousand, four hundred six".