21404350271 has 2 divisors, whose sum is σ = 21404350272. Its totient is φ = 21404350270.

The previous prime is 21404350181. The next prime is 21404350339. The reversal of 21404350271 is 17205340412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404350271 - 2¹⁸ = 21404088127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404352271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702175135 + 10702175136.

It is an arithmetic number, because the mean of its divisors is an integer number (10702175136).

Almost surely, 2^21404350271 is an apocalyptic number.

21404350271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404350271 is an equidigital number, since it uses as much as digits as its factorization.

21404350271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 21404350271 its reverse (17205340412), we get a palindrome (38609690683).

The spelling of 21404350271 in words is "twenty-one billion, four hundred four million, three hundred fifty thousand, two hundred seventy-one".