21042411449 has 2 divisors, whose sum is σ = 21042411450. Its totient is φ = 21042411448.

The previous prime is 21042411431. The next prime is 21042411463. The reversal of 21042411449 is 94411424012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20831726224 + 210685225 = 144332^2 + 14515^2 .

It is a cyclic number.

It is not a de Polignac number, because 21042411449 - 2⁸ = 21042411193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21042411149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521205724 + 10521205725.

It is an arithmetic number, because the mean of its divisors is an integer number (10521205725).

Almost surely, 2^21042411449 is an apocalyptic number.

It is an amenable number.

21042411449 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042411449 is an equidigital number, since it uses as much as digits as its factorization.

21042411449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 21042411449 in words is "twenty-one billion, forty-two million, four hundred eleven thousand, four hundred forty-nine".