21024561426605 has 24 divisors (see below), whose sum is σ = 27807133433856. Its totient is φ = 15248926234080.

The previous prime is 21024561426593. The next prime is 21024561426733. The reversal of 21024561426605 is 50662416542012.

It is not a de Polignac number, because 21024561426605 - 2⁶ = 21024561426541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47123117 + ... + 47567186.

It is an arithmetic number, because the mean of its divisors is an integer number (1158630559744).

Almost surely, 2^{21024561426605} is an apocalyptic number.

It is an amenable number.

21024561426605 is a deficient number, since it is larger than the sum of its proper divisors (6782572007251).

21024561426605 is a wasteful number, since it uses less digits than its factorization.

21024561426605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94690697 (or 94690686 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

Adding to 21024561426605 its reverse (50662416542012), we get a palindrome (71686977968617).

The spelling of 21024561426605 in words is "twenty-one trillion, twenty-four billion, five hundred sixty-one million, four hundred twenty-six thousand, six hundred five".