21214201543 has 2 divisors, whose sum is σ = 21214201544. Its totient is φ = 21214201542.

The previous prime is 21214201531. The next prime is 21214201579. The reversal of 21214201543 is 34510241212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214201543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21214201243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607100771 + 10607100772.

It is an arithmetic number, because the mean of its divisors is an integer number (10607100772).

Almost surely, 2^21214201543 is an apocalyptic number.

21214201543 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214201543 is an equidigital number, since it uses as much as digits as its factorization.

21214201543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21214201543 its reverse (34510241212), we get a palindrome (55724442755).

The spelling of 21214201543 in words is "twenty-one billion, two hundred fourteen million, two hundred one thousand, five hundred forty-three".