47550421 has 2 divisors, whose sum is σ = 47550422. Its totient is φ = 47550420.

The previous prime is 47550409. The next prime is 47550427. The reversal of 47550421 is 12405574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46049796 + 1500625 = 6786^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 47550421 - 2¹⁷ = 47419349 is a prime.

It is a super-2 number, since 2×47550421² = 4522085074554482, which contains 22 as substring.

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 47550421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47550427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23775210 + 23775211.

It is an arithmetic number, because the mean of its divisors is an integer number (23775211).

Almost surely, 2^47550421 is an apocalyptic number.

It is an amenable number.

47550421 is a deficient number, since it is larger than the sum of its proper divisors (1).

47550421 is an equidigital number, since it uses as much as digits as its factorization.

47550421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 47550421 is about 6895.6813296439. The cubic root of 47550421 is about 362.2859197319.

Adding to 47550421 its reverse (12405574), we get a palindrome (59955995).

The spelling of 47550421 in words is "forty-seven million, five hundred fifty thousand, four hundred twenty-one".