66821214 has 32 divisors (see below), whose sum is σ = 141264000. Its totient is φ = 21013344.

The previous prime is 66821201. The next prime is 66821221. The reversal of 66821214 is 41212866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29577 + ... + 31755.

It is an arithmetic number, because the mean of its divisors is an integer number (4414500).

Almost surely, 2^66821214 is an apocalyptic number.

66821214 is an abundant number, since it is smaller than the sum of its proper divisors (74442786).

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

66821214 is a wasteful number, since it uses less digits than its factorization.

66821214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472.

The product of its digits is 4608, while the sum is 30.

The square root of 66821214 is about 8174.4243834046. The cubic root of 66821214 is about 405.7932205949.

The spelling of 66821214 in words is "sixty-six million, eight hundred twenty-one thousand, two hundred fourteen".