21449144742863 has 16 divisors (see below), whose sum is σ = 22745586124800. Its totient is φ = 20156585443200.

The previous prime is 21449144742847. The next prime is 21449144742959. The reversal of 21449144742863 is 36824744194412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21449144742863 - 2⁴ = 21449144742847 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449144742563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28910558 + ... + 29643188.

It is an arithmetic number, because the mean of its divisors is an integer number (1421599132800).

Almost surely, 2^{21449144742863} is an apocalyptic number.

21449144742863 is a deficient number, since it is larger than the sum of its proper divisors (1296441381937).

21449144742863 is a wasteful number, since it uses less digits than its factorization.

21449144742863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735278.

The product of its digits is 37158912, while the sum is 59.

The spelling of 21449144742863 in words is "twenty-one trillion, four hundred forty-nine billion, one hundred forty-four million, seven hundred forty-two thousand, eight hundred sixty-three".