21345013424 has 20 divisors (see below), whose sum is σ = 47263958544. Its totient is φ = 9147862848.

The previous prime is 21345013381. The next prime is 21345013447. The reversal of 21345013424 is 42431054312.

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, 95290127 + ... + 95290350.

Almost surely, 2^21345013424 is an apocalyptic number.

It is an amenable number.

21345013424 is an abundant number, since it is smaller than the sum of its proper divisors (25918945120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21345013424 is a wasteful number, since it uses less digits than its factorization.

21345013424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190580492 (or 190580486 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21345013424 its reverse (42431054312), we get a palindrome (63776067736).

The spelling of 21345013424 in words is "twenty-one billion, three hundred forty-five million, thirteen thousand, four hundred twenty-four".