21414421247 has 2 divisors, whose sum is σ = 21414421248. Its totient is φ = 21414421246.

The previous prime is 21414421207. The next prime is 21414421261. The reversal of 21414421247 is 74212441412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21414421247 - 2⁶ = 21414421183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21414421207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707210623 + 10707210624.

It is an arithmetic number, because the mean of its divisors is an integer number (10707210624).

Almost surely, 2^21414421247 is an apocalyptic number.

21414421247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414421247 is an equidigital number, since it uses as much as digits as its factorization.

21414421247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 32.

Adding to 21414421247 its reverse (74212441412), we get a palindrome (95626862659).

The spelling of 21414421247 in words is "twenty-one billion, four hundred fourteen million, four hundred twenty-one thousand, two hundred forty-seven".