2021340403 has 4 divisors (see below), whose sum is σ = 2127726760. Its totient is φ = 1914954048.

The previous prime is 2021340401. The next prime is 2021340437. The reversal of 2021340403 is 3040431202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3040431202 = 2 ⋅1520215601.

It is a cyclic number.

It is not a de Polignac number, because 2021340403 - 2¹ = 2021340401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 106386337 = 2021340403 / (2 + 0 + 2 + 1 + 3 + 4 + 0 + 4 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021340401) by changing a digit.

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, 53193150 + ... + 53193187.

It is an arithmetic number, because the mean of its divisors is an integer number (531931690).

Almost surely, 2^2021340403 is an apocalyptic number.

2021340403 is a deficient number, since it is larger than the sum of its proper divisors (106386357).

2021340403 is a wasteful number, since it uses less digits than its factorization.

2021340403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106386356.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 2021340403 is about 44959.3194232297. The cubic root of 2021340403 is about 1264.3864090856.

Adding to 2021340403 its reverse (3040431202), we get a palindrome (5061771605).

The spelling of 2021340403 in words is "two billion, twenty-one million, three hundred forty thousand, four hundred three".