21345164548 has 12 divisors (see below), whose sum is σ = 37356100432. Its totient is φ = 10671993000.

The previous prime is 21345164443. The next prime is 21345164549. The reversal of 21345164548 is 84546154312.

It is not an unprimeable number, because it can be changed into a prime (21345164549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60078 + ... + 215173.

Almost surely, 2^21345164548 is an apocalyptic number.

It is an amenable number.

21345164548 is a deficient number, since it is larger than the sum of its proper divisors (16010935884).

21345164548 is a wasteful number, since it uses less digits than its factorization.

21345164548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294642 (or 294640 counting only the distinct ones).

The product of its digits is 460800, while the sum is 43.

The spelling of 21345164548 in words is "twenty-one billion, three hundred forty-five million, one hundred sixty-four thousand, five hundred forty-eight".