21449232643 has 2 divisors, whose sum is σ = 21449232644. Its totient is φ = 21449232642.

The previous prime is 21449232611. The next prime is 21449232647. The reversal of 21449232643 is 34623294412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21449232643 - 2⁵ = 21449232611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21449232596 and 21449232605.

It is not a weakly prime, because it can be changed into another prime (21449232647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724616321 + 10724616322.

It is an arithmetic number, because the mean of its divisors is an integer number (10724616322).

Almost surely, 2^21449232643 is an apocalyptic number.

21449232643 is a deficient number, since it is larger than the sum of its proper divisors (1).

21449232643 is an equidigital number, since it uses as much as digits as its factorization.

21449232643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 40.

The spelling of 21449232643 in words is "twenty-one billion, four hundred forty-nine million, two hundred thirty-two thousand, six hundred forty-three".