2146666221 has 24 divisors (see below), whose sum is σ = 3578799744. Its totient is φ = 1214517600.

The previous prime is 2146666201. The next prime is 2146666273. The reversal of 2146666221 is 1226666412.

It is not a de Polignac number, because 2146666221 - 2¹¹ = 2146664173 is a prime.

It is a super-3 number, since 3×2146666221³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2146666201) 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, 162321 + ... + 175046.

It is an arithmetic number, because the mean of its divisors is an integer number (149116656).

Almost surely, 2^2146666221 is an apocalyptic number.

2146666221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2146666221 is a deficient number, since it is larger than the sum of its proper divisors (1432133523).

2146666221 is a wasteful number, since it uses less digits than its factorization.

2146666221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337481 (or 337478 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 2146666221 is about 46332.1294675736. The cubic root of 2146666221 is about 1289.9954371571.

The spelling of 2146666221 in words is "two billion, one hundred forty-six million, six hundred sixty-six thousand, two hundred twenty-one".