47213821 has 2 divisors, whose sum is σ = 47213822. Its totient is φ = 47213820.

The previous prime is 47213809. The next prime is 47213833. The reversal of 47213821 is 12831274.

It is a balanced prime because it is at equal distance from previous prime (47213809) and next prime (47213833).

It can be written as a sum of positive squares in only one way, i.e., 46430596 + 783225 = 6814^2 + 885^2 .

It is a cyclic number.

It is not a de Polignac number, because 47213821 - 2⁷ = 47213693 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47213821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47213801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23606910 + 23606911.

It is an arithmetic number, because the mean of its divisors is an integer number (23606911).

Almost surely, 2^47213821 is an apocalyptic number.

It is an amenable number.

47213821 is a deficient number, since it is larger than the sum of its proper divisors (1).

47213821 is an equidigital number, since it uses as much as digits as its factorization.

47213821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 47213821 is about 6871.2314034676. The cubic root of 47213821 is about 361.4290445980.

The spelling of 47213821 in words is "forty-seven million, two hundred thirteen thousand, eight hundred twenty-one".