21449941771 has 2 divisors, whose sum is σ = 21449941772. Its totient is φ = 21449941770.

The previous prime is 21449941753. The next prime is 21449941789. The reversal of 21449941771 is 17714994412.

It is a balanced prime because it is at equal distance from previous prime (21449941753) and next prime (21449941789).

It is a cyclic number.

It is not a de Polignac number, because 21449941771 - 2¹⁷ = 21449810699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21449911771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724970885 + 10724970886.

It is an arithmetic number, because the mean of its divisors is an integer number (10724970886).

Almost surely, 2^21449941771 is an apocalyptic number.

21449941771 is a deficient number, since it is larger than the sum of its proper divisors (1).

21449941771 is an equidigital number, since it uses as much as digits as its factorization.

21449941771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 49.

The spelling of 21449941771 in words is "twenty-one billion, four hundred forty-nine million, nine hundred forty-one thousand, seven hundred seventy-one".