47206721 has 4 divisors (see below), whose sum is σ = 47223600. Its totient is φ = 47189844.

The previous prime is 47206717. The next prime is 47206727. The reversal of 47206721 is 12760274.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47206721 - 2² = 47206717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47206727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3131 + ... + 10208.

It is an arithmetic number, because the mean of its divisors is an integer number (11805900).

Almost surely, 2^47206721 is an apocalyptic number.

It is an amenable number.

47206721 is a deficient number, since it is larger than the sum of its proper divisors (16879).

47206721 is a wasteful number, since it uses less digits than its factorization.

47206721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16878.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 47206721 is about 6870.7147372017. The cubic root of 47206721 is about 361.4109264933.

Adding to 47206721 its reverse (12760274), we get a palindrome (59966995).

The spelling of 47206721 in words is "forty-seven million, two hundred six thousand, seven hundred twenty-one".