2021147 has 4 divisors (see below), whose sum is σ = 2140056. Its totient is φ = 1902240.

The previous prime is 2021143. The next prime is 2021167. The reversal of 2021147 is 7411202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021147 - 2² = 2021143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 118891 = 2021147 / (2 + 0 + 2 + 1 + 1 + 4 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59429 + ... + 59462.

It is an arithmetic number, because the mean of its divisors is an integer number (535014).

2^2021147 is an apocalyptic number.

2021147 is a deficient number, since it is larger than the sum of its proper divisors (118909).

2021147 is a wasteful number, since it uses less digits than its factorization.

2021147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118908.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 2021147 is about 1421.6704962825. The cubic root of 2021147 is about 126.4346082062.

Adding to 2021147 its reverse (7411202), we get a palindrome (9432349).

The spelling of 2021147 in words is "two million, twenty-one thousand, one hundred forty-seven".