21448215193 has 2 divisors, whose sum is σ = 21448215194. Its totient is φ = 21448215192.

The previous prime is 21448215169. The next prime is 21448215203. The reversal of 21448215193 is 39151284412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12344765449 + 9103449744 = 111107^2 + 95412^2 .

It is a cyclic number.

It is not a de Polignac number, because 21448215193 - 2⁵ = 21448215161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21448215133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724107596 + 10724107597.

It is an arithmetic number, because the mean of its divisors is an integer number (10724107597).

Almost surely, 2^21448215193 is an apocalyptic number.

It is an amenable number.

21448215193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21448215193 is an equidigital number, since it uses as much as digits as its factorization.

21448215193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The spelling of 21448215193 in words is "twenty-one billion, four hundred forty-eight million, two hundred fifteen thousand, one hundred ninety-three".