2021623393 has 2 divisors, whose sum is σ = 2021623394. Its totient is φ = 2021623392.

The previous prime is 2021623369. The next prime is 2021623397. The reversal of 2021623393 is 3933261202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1461685824 + 559937569 = 38232^2 + 23663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021623393 is a prime.

It is a super-2 number, since 2×2021623393² = 8173922286249664898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021623397) 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, 1010811696 + 1010811697.

It is an arithmetic number, because the mean of its divisors is an integer number (1010811697).

Almost surely, 2^2021623393 is an apocalyptic number.

It is an amenable number.

2021623393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021623393 is an equidigital number, since it uses as much as digits as its factorization.

2021623393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 2021623393 is about 44962.4664915082. The cubic root of 2021623393 is about 1264.4454115200.

Adding to 2021623393 its reverse (3933261202), we get a palindrome (5954884595).

The spelling of 2021623393 in words is "two billion, twenty-one million, six hundred twenty-three thousand, three hundred ninety-three".