21448980647 has 2 divisors, whose sum is σ = 21448980648. Its totient is φ = 21448980646.

The previous prime is 21448980499. The next prime is 21448980689. The reversal of 21448980647 is 74608984412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21448980647 - 2²⁶ = 21381871783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21447980647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724490323 + 10724490324.

It is an arithmetic number, because the mean of its divisors is an integer number (10724490324).

Almost surely, 2^21448980647 is an apocalyptic number.

21448980647 is a deficient number, since it is larger than the sum of its proper divisors (1).

21448980647 is an equidigital number, since it uses as much as digits as its factorization.

21448980647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 21448980647 in words is "twenty-one billion, four hundred forty-eight million, nine hundred eighty thousand, six hundred forty-seven".