2021131247 has 2 divisors, whose sum is σ = 2021131248. Its totient is φ = 2021131246.

The previous prime is 2021131159. The next prime is 2021131261. The reversal of 2021131247 is 7421311202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021131247 - 2²⁰ = 2020082671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021131267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010565623 + 1010565624.

It is an arithmetic number, because the mean of its divisors is an integer number (1010565624).

Almost surely, 2^2021131247 is an apocalyptic number.

2021131247 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021131247 is an equidigital number, since it uses as much as digits as its factorization.

2021131247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2021131247 is about 44956.9933047129. The cubic root of 2021131247 is about 1264.3427972451.

Adding to 2021131247 its reverse (7421311202), we get a palindrome (9442442449).

The spelling of 2021131247 in words is "two billion, twenty-one million, one hundred thirty-one thousand, two hundred forty-seven".