66282021 has 24 divisors (see below), whose sum is σ = 107592576. Its totient is φ = 39013920.

The previous prime is 66282017. The next prime is 66282037. The reversal of 66282021 is 12028266.

It is not a de Polignac number, because 66282021 - 2² = 66282017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66282091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9625 + ... + 15006.

It is an arithmetic number, because the mean of its divisors is an integer number (4483024).

Almost surely, 2^66282021 is an apocalyptic number.

It is an amenable number.

66282021 is a deficient number, since it is larger than the sum of its proper divisors (41310555).

66282021 is a wasteful number, since it uses less digits than its factorization.

66282021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24673 (or 24670 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66282021 is about 8141.3770948163. The cubic root of 66282021 is about 404.6987975389.

It can be divided in two parts, 6628 and 2021, that added together give a square (8649 = 93²).

The spelling of 66282021 in words is "sixty-six million, two hundred eighty-two thousand, twenty-one".