66227021 has 8 divisors (see below), whose sum is σ = 76818240. Its totient is φ = 55918368.

The previous prime is 66227017. The next prime is 66227047. The reversal of 66227021 is 12072266.

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

It is a cyclic number.

It is not a de Polignac number, because 66227021 - 2² = 66227017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66227011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70136 + ... + 71073.

It is an arithmetic number, because the mean of its divisors is an integer number (9602280).

Almost surely, 2^66227021 is an apocalyptic number.

It is an amenable number.

66227021 is a deficient number, since it is larger than the sum of its proper divisors (10591219).

66227021 is a wasteful number, since it uses less digits than its factorization.

66227021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141283.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66227021 is about 8137.9985868763. The cubic root of 66227021 is about 404.5868285467.

Adding to 66227021 its reverse (12072266), we get a palindrome (78299287).

The spelling of 66227021 in words is "sixty-six million, two hundred twenty-seven thousand, twenty-one".