21245345531324 has 12 divisors (see below), whose sum is σ = 39136162821000. Its totient is φ = 10063584725328.

The previous prime is 21245345531317. The next prime is 21245345531383. The reversal of 21245345531324 is 42313554354212.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 139772009999 + ... + 139772010150.

It is an arithmetic number, because the mean of its divisors is an integer number (3261346901750).

Almost surely, 2^{21245345531324} is an apocalyptic number.

It is an amenable number.

21245345531324 is a deficient number, since it is larger than the sum of its proper divisors (17890817289676).

21245345531324 is a wasteful number, since it uses less digits than its factorization.

21245345531324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279544020172 (or 279544020170 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 44.

Adding to 21245345531324 its reverse (42313554354212), we get a palindrome (63558899885536).

The spelling of 21245345531324 in words is "twenty-one trillion, two hundred forty-five billion, three hundred forty-five million, five hundred thirty-one thousand, three hundred twenty-four".