21062406 has 8 divisors (see below), whose sum is σ = 42124824. Its totient is φ = 7020800.

The previous prime is 21062401. The next prime is 21062407. The reversal of 21062406 is 60426012.

It is a happy number.

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

21062406 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062401) 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, 1755195 + ... + 1755206.

It is an arithmetic number, because the mean of its divisors is an integer number (5265603).

Almost surely, 2^21062406 is an apocalyptic number.

21062406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21062406 is a wasteful number, since it uses less digits than its factorization.

21062406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510406.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21062406 is about 4589.3796966475. The cubic root of 21062406 is about 276.1654385160.

Adding to 21062406 its reverse (60426012), we get a palindrome (81488418).

The spelling of 21062406 in words is "twenty-one million, sixty-two thousand, four hundred six".