2021244145 has 4 divisors (see below), whose sum is σ = 2425492980. Its totient is φ = 1616995312.

The previous prime is 2021244131. The next prime is 2021244161. The reversal of 2021244145 is 5414421202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5414421202 = 2 ⋅2707210601.

It can be written as a sum of positive squares in 2 ways, for example, as 1570616161 + 450627984 = 39631^2 + 21228^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021244145 - 2²¹ = 2019146993 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202124410 + ... + 202124419.

It is an arithmetic number, because the mean of its divisors is an integer number (606373245).

Almost surely, 2^2021244145 is an apocalyptic number.

It is an amenable number.

2021244145 is a deficient number, since it is larger than the sum of its proper divisors (404248835).

2021244145 is an equidigital number, since it uses as much as digits as its factorization.

2021244145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404248834.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 2021244145 is about 44958.2489094048. The cubic root of 2021244145 is about 1264.3663383710.

Adding to 2021244145 its reverse (5414421202), we get a palindrome (7435665347).

The spelling of 2021244145 in words is "two billion, twenty-one million, two hundred forty-four thousand, one hundred forty-five".