21449491027 has 2 divisors, whose sum is σ = 21449491028. Its totient is φ = 21449491026.

The previous prime is 21449490991. The next prime is 21449491057. The reversal of 21449491027 is 72019494412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21449491027 - 2³¹ = 19302007379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21449491057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724745513 + 10724745514.

It is an arithmetic number, because the mean of its divisors is an integer number (10724745514).

Almost surely, 2^21449491027 is an apocalyptic number.

21449491027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21449491027 is an equidigital number, since it uses as much as digits as its factorization.

21449491027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 21449491027 in words is "twenty-one billion, four hundred forty-nine million, four hundred ninety-one thousand, twenty-seven".