47850021 has 10 divisors (see below), whose sum is σ = 71479782. Its totient is φ = 31899960.

The previous prime is 47850007. The next prime is 47850031. The reversal of 47850021 is 12005874.

It can be written as a sum of positive squares in only one way, i.e., 45077796 + 2772225 = 6714^2 + 1665^2 .

It is not a de Polignac number, because 47850021 - 2¹⁸ = 47587877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47850001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 295290 + ... + 295451.

Almost surely, 2^47850021 is an apocalyptic number.

It is an amenable number.

47850021 is a deficient number, since it is larger than the sum of its proper divisors (23629761).

47850021 is an equidigital number, since it uses as much as digits as its factorization.

47850021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590753 (or 590744 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 47850021 is about 6917.3709601264. The cubic root of 47850021 is about 363.0452098598.

Adding to 47850021 its reverse (12005874), we get a palindrome (59855895).

The spelling of 47850021 in words is "forty-seven million, eight hundred fifty thousand, twenty-one".