21062006 has 8 divisors (see below), whose sum is σ = 36106320. Its totient is φ = 9026568.

The previous prime is 21062003. The next prime is 21062017. The reversal of 21062006 is 60026012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21062003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752201 + ... + 752228.

It is an arithmetic number, because the mean of its divisors is an integer number (4513290).

Almost surely, 2^21062006 is an apocalyptic number.

21062006 is a deficient number, since it is larger than the sum of its proper divisors (15044314).

21062006 is a wasteful number, since it uses less digits than its factorization.

21062006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504438.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21062006 is about 4589.3361175665. The cubic root of 21062006 is about 276.1636902689.

Adding to 21062006 its reverse (60026012), we get a palindrome (81088018).

The spelling of 21062006 in words is "twenty-one million, sixty-two thousand, six".