1206616221 has 12 divisors (see below), whose sum is σ = 1743318720. Its totient is φ = 804213000.

The previous prime is 1206616207. The next prime is 1206616273. The reversal of 1206616221 is 1226166021.

1206616221 is a `hidden beast` number, since 1 + 20 + 6 + 616 + 2 + 21 = 666.

1206616221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1206616221 - 2¹⁷ = 1206485149 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206618221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28650 + ... + 56868.

It is an arithmetic number, because the mean of its divisors is an integer number (145276560).

Almost surely, 2^1206616221 is an apocalyptic number.

It is an amenable number.

1206616221 is a deficient number, since it is larger than the sum of its proper divisors (536702499).

1206616221 is a wasteful number, since it uses less digits than its factorization.

1206616221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32976 (or 32973 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1206616221 is about 34736.3818064000. The cubic root of 1206616221 is about 1064.6079863841.

The spelling of 1206616221 in words is "one billion, two hundred six million, six hundred sixteen thousand, two hundred twenty-one".