47216421 has 12 divisors (see below), whose sum is σ = 77944672. Its totient is φ = 26980776.

The previous prime is 47216419. The next prime is 47216443. The reversal of 47216421 is 12461274.

47216421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 47216421 - 2¹ = 47216419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47216621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 374671 + ... + 374796.

Almost surely, 2^47216421 is an apocalyptic number.

It is an amenable number.

47216421 is a deficient number, since it is larger than the sum of its proper divisors (30728251).

47216421 is a wasteful number, since it uses less digits than its factorization.

47216421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749480 (or 749477 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 47216421 is about 6871.4205954810. The cubic root of 47216421 is about 361.4356789426.

Adding to 47216421 its reverse (12461274), we get a palindrome (59677695).

The spelling of 47216421 in words is "forty-seven million, two hundred sixteen thousand, four hundred twenty-one".