21345520002424 has 16 divisors (see below), whose sum is σ = 42377135299200. Its totient is φ = 10044950589312.

The previous prime is 21345520002409. The next prime is 21345520002451. The reversal of 21345520002424 is 42420002554312.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 21345520002424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78476176344 + ... + 78476176615.

It is an arithmetic number, because the mean of its divisors is an integer number (2648570956200).

Almost surely, 2^{21345520002424} is an apocalyptic number.

It is an amenable number.

21345520002424 is a deficient number, since it is larger than the sum of its proper divisors (21031615296776).

21345520002424 is a wasteful number, since it uses less digits than its factorization.

21345520002424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156952352982 (or 156952352978 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

Adding to 21345520002424 its reverse (42420002554312), we get a palindrome (63765522556736).

The spelling of 21345520002424 in words is "twenty-one trillion, three hundred forty-five billion, five hundred twenty million, two thousand, four hundred twenty-four".