21221440412433 has 16 divisors (see below), whose sum is σ = 28580951243520. Its totient is φ = 14005480221824.

The previous prime is 21221440412411. The next prime is 21221440412441. The reversal of 21221440412433 is 33421404412212.

It is a cyclic number.

It is not a de Polignac number, because 21221440412433 - 2⁸ = 21221440412177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221440412394 and 21221440412403.

It is not an unprimeable number, because it can be changed into a prime (21221440412443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87623913 + ... + 87865766.

It is an arithmetic number, because the mean of its divisors is an integer number (1786309452720).

Almost surely, 2^{21221440412433} is an apocalyptic number.

It is an amenable number.

21221440412433 is a deficient number, since it is larger than the sum of its proper divisors (7359510831087).

21221440412433 is a wasteful number, since it uses less digits than its factorization.

21221440412433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175490088.

The product of its (nonzero) digits is 36864, while the sum is 33.

Adding to 21221440412433 its reverse (33421404412212), we get a palindrome (54642844824645).

The spelling of 21221440412433 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred forty million, four hundred twelve thousand, four hundred thirty-three".