6543212101 has 2 divisors, whose sum is σ = 6543212102. Its totient is φ = 6543212100.

The previous prime is 6543212057. The next prime is 6543212111. The reversal of 6543212101 is 1012123456.

It is a happy number.

6543212101 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6540603876 + 2608225 = 80874^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 6543212101 - 2⁹ = 6543211589 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6543212111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271606050 + 3271606051.

It is an arithmetic number, because the mean of its divisors is an integer number (3271606051).

Almost surely, 2^6543212101 is an apocalyptic number.

It is an amenable number.

6543212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543212101 is an equidigital number, since it uses as much as digits as its factorization.

6543212101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 6543212101 is about 80890.1236307622. The cubic root of 6543212101 is about 1870.3820795533.

Adding to 6543212101 its reverse (1012123456), we get a palindrome (7555335557).

The spelling of 6543212101 in words is "six billion, five hundred forty-three million, two hundred twelve thousand, one hundred one".