20343140221 has 2 divisors, whose sum is σ = 20343140222. Its totient is φ = 20343140220.

The previous prime is 20343140179. The next prime is 20343140239. The reversal of 20343140221 is 12204134302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20074639225 + 268500996 = 141685^2 + 16386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20343140221 - 2¹⁵ = 20343107453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20343140192 and 20343140201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20343140281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171570110 + 10171570111.

It is an arithmetic number, because the mean of its divisors is an integer number (10171570111).

Almost surely, 2^20343140221 is an apocalyptic number.

It is an amenable number.

20343140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20343140221 is an equidigital number, since it uses as much as digits as its factorization.

20343140221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20343140221 its reverse (12204134302), we get a palindrome (32547274523).

The spelling of 20343140221 in words is "twenty billion, three hundred forty-three million, one hundred forty thousand, two hundred twenty-one".