21060766 has 8 divisors (see below), whose sum is σ = 31660200. Its totient is φ = 10507368.

The previous prime is 21060763. The next prime is 21060829. The reversal of 21060766 is 66706012.

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 (21060763) 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, 10341 + ... + 12208.

It is an arithmetic number, because the mean of its divisors is an integer number (3957525).

Almost surely, 2^21060766 is an apocalyptic number.

21060766 is a deficient number, since it is larger than the sum of its proper divisors (10599434).

21060766 is a wasteful number, since it uses less digits than its factorization.

21060766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23018.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21060766 is about 4589.2010197855. The cubic root of 21060766 is about 276.1582705620.

Adding to 21060766 its reverse (66706012), we get a palindrome (87766778).

The spelling of 21060766 in words is "twenty-one million, sixty thousand, seven hundred sixty-six".