21022171343 has 2 divisors, whose sum is σ = 21022171344. Its totient is φ = 21022171342.

The previous prime is 21022171309. The next prime is 21022171381. The reversal of 21022171343 is 34317122012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022171343 - 2⁶ = 21022171279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022171393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511085671 + 10511085672.

It is an arithmetic number, because the mean of its divisors is an integer number (10511085672).

Almost surely, 2^21022171343 is an apocalyptic number.

21022171343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022171343 is an equidigital number, since it uses as much as digits as its factorization.

21022171343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21022171343 its reverse (34317122012), we get a palindrome (55339293355).

The spelling of 21022171343 in words is "twenty-one billion, twenty-two million, one hundred seventy-one thousand, three hundred forty-three".