47221021 has 4 divisors (see below), whose sum is σ = 47391772. Its totient is φ = 47050272.

The previous prime is 47221007. The next prime is 47221033. The reversal of 47221021 is 12012274.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12012274 = 2 ⋅6006137.

It can be written as a sum of positive squares in 2 ways, for example, as 30525625 + 16695396 = 5525^2 + 4086^2 .

It is a cyclic number.

It is not a de Polignac number, because 47221021 - 2¹³ = 47212829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47221081) 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 3 ways as a sum of consecutive naturals, for example, 84960 + ... + 85513.

It is an arithmetic number, because the mean of its divisors is an integer number (11847943).

Almost surely, 2^47221021 is an apocalyptic number.

It is an amenable number.

47221021 is a deficient number, since it is larger than the sum of its proper divisors (170751).

47221021 is a wasteful number, since it uses less digits than its factorization.

47221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170750.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 47221021 is about 6871.7553070522. The cubic root of 47221021 is about 361.4474160325.

Adding to 47221021 its reverse (12012274), we get a palindrome (59233295).

The spelling of 47221021 in words is "forty-seven million, two hundred twenty-one thousand, twenty-one".