47721213 has 12 divisors (see below), whose sum is σ = 69132700. Its totient is φ = 31720896.

The previous prime is 47721199. The next prime is 47721241. The reversal of 47721213 is 31212774.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42536484 + 5184729 = 6522^2 + 2277^2 .

It is not a de Polignac number, because 47721213 - 2⁴ = 47721197 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 (47721413) 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, 4456 + ... + 10737.

Almost surely, 2^47721213 is an apocalyptic number.

It is an amenable number.

47721213 is a deficient number, since it is larger than the sum of its proper divisors (21411487).

47721213 is a wasteful number, since it uses less digits than its factorization.

47721213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15548 (or 15545 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 47721213 is about 6908.0542122945. The cubic root of 47721213 is about 362.7191553113.

Adding to 47721213 its reverse (31212774), we get a palindrome (78933987).

The spelling of 47721213 in words is "forty-seven million, seven hundred twenty-one thousand, two hundred thirteen".