47802421 has 2 divisors, whose sum is σ = 47802422. Its totient is φ = 47802420.

The previous prime is 47802397. The next prime is 47802427. The reversal of 47802421 is 12420874.

47802421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43956900 + 3845521 = 6630^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 47802421 - 2⁵ = 47802389 is a prime.

It is a super-2 number, since 2×47802421² = 4570142906922482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 47802421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47802427) 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 as a sum of consecutive naturals, namely, 23901210 + 23901211.

It is an arithmetic number, because the mean of its divisors is an integer number (23901211).

Almost surely, 2^47802421 is an apocalyptic number.

It is an amenable number.

47802421 is a deficient number, since it is larger than the sum of its proper divisors (1).

47802421 is an equidigital number, since it uses as much as digits as its factorization.

47802421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 47802421 is about 6913.9294905285. The cubic root of 47802421 is about 362.9247871654.

The spelling of 47802421 in words is "forty-seven million, eight hundred two thousand, four hundred twenty-one".