21432241273 has 2 divisors, whose sum is σ = 21432241274. Its totient is φ = 21432241272.

The previous prime is 21432241267. The next prime is 21432241289. The reversal of 21432241273 is 37214223412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19677636729 + 1754604544 = 140277^2 + 41888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21432241273 is a prime.

It is not a weakly prime, because it can be changed into another prime (21432241213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716120636 + 10716120637.

It is an arithmetic number, because the mean of its divisors is an integer number (10716120637).

Almost surely, 2^21432241273 is an apocalyptic number.

It is an amenable number.

21432241273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432241273 is an equidigital number, since it uses as much as digits as its factorization.

21432241273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 31.

Adding to 21432241273 its reverse (37214223412), we get a palindrome (58646464685).

The spelling of 21432241273 in words is "twenty-one billion, four hundred thirty-two million, two hundred forty-one thousand, two hundred seventy-three".